Malicious PDF — malware analysis report

Static analysis result for SHA-256 a762a96ecd54dcb7…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 18:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1225ac3b663c77124d2d895ac33339aa SHA-1: 444a4f75155c196eb9c7b5a05e5c517afea6afb2 SHA-256: a762a96ecd54dcb76ca53ba0d1135cdba79c6d2a5d24e12f889f9fb772848a38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple URLs hosted on compromised WordPress sites and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=me+gate+2020+paper+solution PDF link annotation
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5855bc8c7---58653653942.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c27a2961275---11470550069.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-11/20210611061653693053.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/1hn90cc1cn43ge83kmebt9uh4c/13949223921.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3deaff4961cfd165ce62bfe8c2bc2ac6/mupowokuvupete.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/33632019373.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b87669c45269989d1245f3241f938cec/39112657761.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee775f457---wulolisewuguvazafupogigu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c17fb9b0cfd---mafom.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e8585763---gapabefanur.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc486528b16---35931922999.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8kh0gmikoeqltaq5cdbi4un6n4/45323359182.pdfIn PDF document text
    • https://ubranni.com/uploader/files/tufepedijufen.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/66172bc3565db9900b45f10b3267776a/80113993993.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213eaa6e7a---laxasizozutedege.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f21600cdf40c7c40db4430b6e056589a/65354180205.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/88108400580.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/37966077185.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6u3p0ai2ro2rti1m8vu88dsvlv/jowabadajedivuduvewi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8a7f00e501d1a2bfbcfb66e04e99c037/38667154188.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c888426b6---pugozaxoxuv.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd849bd2b---sezal.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e073dc32d---pofolatotufujavivuza.pdfIn PDF document text
    • http://standardamulet.com/files/files/bitevifirape.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1auscqap49q4rqugg30qp7lt80/78029788692.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/sikuze.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/dubija.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 17784 bytes
SHA-256: 0ded69054407e5f721891a84924a9a50b1d06aa77795c87496b3b9b88059c445
font_01_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00014cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 10760 bytes
SHA-256: 8cd15b6d15d3857c91c131804411e421c77684482cd2cedd6a2f5a25f99c8629

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