Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cd2feb13235ec8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-21 03:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38ee2d0983d00a3d0aaf284113a6d84f SHA-1: 1f2547018ea8701a6a5e31222aa30bf58f7f5a9a SHA-256: a0cd2feb13235ec8a4f1db9b0a72df4dedf938e7a41ca4e603bc64e157be5b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://okmarin.ru/userfiles/file/puxaroruxanetojuta.pdf In PDF document text
    • http://teplolux72.ru/upload/file/zifuxitosomokavazag.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613e3f2c6d6e0.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16135c76200a5b---45980096524.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/74448896539.pdfIn PDF document text
    • http://strahyi.ru/images/file/96968331210.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/70383402881.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/42683752616.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe9503a15---jejobogenanosexum.pdfIn PDF document text
    • http://ahknchem.com/upload/files/24692369948.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/nulonatolosimumikivelitiz.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/52441862392.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/22231814428.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gavixelirifan.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/velikes.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/batudusiruxuj.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/dakapekaberukutufefonoz.pdfIn PDF document text
    • http://fabtur.ru/upload/files/wutaxisetoromigabimej.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/4445092103.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/mesedet.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/mafuzapibuwe.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/kugugala.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/45384853095.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/tujisipuzaju.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/56875313038.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/nademukofufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=marvel+android+themesPDF 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_off0000b678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 10572 bytes
SHA-256: f2f1774e046c7e41f58d0ced47886f7cf5123f8c6720591d25ff99c2a0f2b8e2
font_02_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 15808 bytes
SHA-256: 8b1cf6c1087b2be7fadf3b7035fa6766270b263eabb520d14e59acd8d74c9084

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