Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d46dd6d26a1cf0a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 20:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0060fde81c9beabff455635695e1580 SHA-1: 87781834d015982cc98c26374f449cde2408bfb0 SHA-256: 9d46dd6d26a1cf0ac5eb6354f43ca93ba551dc8ca476070a14f872071e297ab4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to lure victims. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pistant.ru/uplcv?utm_term=dual+boot+windows+10+and+android
    • http://monticellotownship.org/userfiles/file/siretuloguvipizex.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/detodixitugugekesatujabem.pdf
    • http://baodieptailor.com/uploads/2021-09-07/images/files/78347740978.pdf
    • http://flemingdecal.com/uploads/assets/file/padumukixenulol.pdf
    • https://hargagila.com/uploads/image/files/wumiwukipapixuzumuz.pdf
    • https://mehregancenter.ir/images/upload/files/38165057609.pdf
    • https://pasarantogel.com/contents/files/kekawuso.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/31281006499.pdf
    • http://sigmabhp.pl/userfiles/file/sutetinonudalimifa.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/987c835d9e6a331dd8efc3d159dcae73/42142133803.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c34c79577a---zujokupi.pdf
    • http://vititanon.com/user_img/files/82141993641.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/19476918407.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9390c98f---97827290372.pdf
    • http://tylincms.com/userfiles/files/nuxesaxajekuna.pdf
    • https://portofcrotone.com/dati/upload/file/98398838845.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eo2qllg4gfqbkb9hv87l8f6s36/29938939375.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pobilaxitenatoxaju.pdf
    • http://svadbavmoskve.com/content/xuploadimages/file/84601302197.pdf
    • http://vagtteam.dk/userfiles/Files/6161010095.pdf
    • http://yokohama-model.com/userfiles/files/26179635948.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5724fbf3cbb8f44c47d1bf0937ebf244/74926835009.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a6a66222---vivubinupilakade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e025.bin
1054c6c41fcf565fde04dcfbd1de4adf867958f549a54ddf21b2ab7153223896
pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 18044 bytes
font_01_sfnt_off00010eef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
font_02_sfnt_off00012706.bin
270cd185bf898776388992477cd51baffbd26d908284ac242bcc90b201065fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 10608 bytes