Malicious PDF — malware analysis report

Static analysis result for SHA-256 7588b80ef9e3c860…

MALICIOUS

PDF

100.1 KB Created: 2021-07-24 12:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e957d701736ccfe2b189fb747b8c15d4 SHA-1: 90769f653c9f9d1004d07c0eaf661013f3938f5b SHA-256: 7588b80ef9e3c860810b740bdc8056b2df3ff9def8e79afda6f8e4b024981dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • 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 http://curry-box-deluxe.de/userfiles/file/kodoz.pdf In PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mupubosupusozaseketixab.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5f70e1367---gosewilesilawexalanotukez.pdfIn PDF document text
    • http://stonebreaker.at/zirilazivafodonupep.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/tazetomi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xozuvilij.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a1bb79c6---jipasenilakerinafutobupa.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/85502412256.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2266dee6ba---11919487598.pdfIn PDF document text
    • https://avenue102.com/uploads/file/samafupegof.pdfIn PDF document text
    • http://mfahk.com/upload/files/23258266879.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a935c9954d8---69310358929.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/66004650699.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/56590290966.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5ef8785ce7c0793534641167d2719c8e/16132659995.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f25fc84c7e72cd42b0c6e6802041f1f0/65880629102.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a44951db72c---81186307233.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31f826686---68888361979.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a795d04a3bf---gabigivir.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210531_29846A602A912242.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/83468109219.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/sozelavebuti.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1807f6f7db2cedf04dabb8d84c1066b0/87052105771.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/1mqgrdvd9uhmnsfjueb0scaaee/wiganapesug.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090afd52fe41---sepuzabuwawidaxaxurixezo.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/nefopadi.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/nozim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=are+we+going+back+to+school+in+february+2021PDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16944 bytes
SHA-256: ba84e205e7d7d415930e8b24c2c198e63f3cf7bc3bfadff918f13ce56cfca0ef
font_01_sfnt_off00014efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16713 11424 bytes
SHA-256: e0e7291a337c4c3377488cab418cbbe687e6c5383a8a1f85fdc7ece2736ab2b4

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