Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84926ea31472cd1…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 10:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07252d3d3f37e29963a83f7394cdf3d0 SHA-1: cb8276f93fb0acd2479b5412d60a5e66cec464a1 SHA-256: e84926ea31472cd17d4428f03bcaabf9d73ac1b4cc4d30199223b02922405a58
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirecting users to external content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://puisan.ru/uploads/file/bikodur.pdf In PDF document text
    • http://abwlondonblvd.com/uploads/files/dimidevinapozegidovido.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/8729127566.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/pavemawidojob.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363a2a89fe8---gitumesumov.pdfIn PDF document text
    • https://soechi.id/userfiles/file/59390123956.pdfIn PDF document text
    • https://birudongker.com/contents/files/rupewimijuxojaj.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/34328639709.pdfIn PDF document text
    • http://xsteelstock.com/d/files/6991750118.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/17806814486.pdfIn PDF document text
    • https://izometal.net/mm/file/14699035605.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dja8d3id02k6t9n36j6fpnnnm3/sivikazavekejepus.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/mederogikojejijod.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96477415396.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/zotesezozevi.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/51155699125.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/37662206005.pdfIn PDF document text
    • https://forssah.co/userfiles/file/nogub.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/718dc14b0bde36cbfe28038c08f6cf2c/69556345830.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/93573261919.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/47947423498.pdfIn PDF document text
    • http://calisnt.com/uploads/files/mavivije.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/guxusolupigutubekumekipu.pdfIn PDF document text
    • http://vinhomescaurao.info/app/webroot/img/files/janiwixitepuwofenijewore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pictures+of+minecraft+buildsPDF 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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 15696 bytes
SHA-256: 3c2432a402522cff4a52b6b77870287c3235dae1e58df96e024b913e050b1755
font_02_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10880 bytes
SHA-256: 7f7661d66837e3b396a9f452610aad39c2bdbbed45539696092b4cdb7ea5bdeb