Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3139a8dcb3014e…

MALICIOUS

PDF

109.9 KB Created: 2021-09-04 19:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5c383a508c1c21e9a43ecd85cb6268f SHA-1: 041172d58251d9c8f8f3bcb82461b47d4645a1a9 SHA-256: 8d3139a8dcb3014e8e91a3c1a72dc7d99fda73293fe90e66965443cc341edf5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://malopolskiszlakwinny.pl/upload/File/mamevofavurug.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea406dbced---kazutidazipupexi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c272e50d088c6b4502c9b12cbe08e1d5/bitisa.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/88010116839.pdfIn PDF document text
    • http://scro.ru/pic/file/74637579722.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/96781169677.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170527b3cea---juxirinilafit.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7dd3666377415611c26aea51a4af9be0/6285385727.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/af8762f1eb44fe81100f1dbc36cce692/41717380268.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/kejidibiruduwagigoba.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/b48e17eddc8e21bead9b98fc39e9f340/66159069251.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/23601886699.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3dd626244---goxupaxewexuroked.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lisopixevoduzumenusorewi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zutugi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe75731bdb---penujono.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/49682691345.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25bfcbd65---66050403213.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/14978895325.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/48196588730.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210806204417.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/repatonepubobimed.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/sawufotagawigomuleb.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7474d88ffd168a9a7141f5728ba9dc8d/labawoxurilovevolajopumoj.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/35841696849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=autocad+electrical+2016+tutorial+for+beginners+pdfPDF 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_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE5 11476 bytes
SHA-256: 77b3b2d2186d16ca27cb428fd6ebf1bc4f45ff7e893f8724050982be226e4c1d
font_02_sfnt_off000175d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D6 19216 bytes
SHA-256: 6e7a9a1ccf0f6c4f162af3dad6beab3b74001978b61386e4c77a3b94099b04eb

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