Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c099cbf15e4bdf5…

MALICIOUS

PDF

87.1 KB Created: 2021-07-18 23:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d66e261f262e0cb9a3e5c55e1f8d4f4 SHA-1: d8e0918f2ac6b79fce9bc136a585d04263c46b4f SHA-256: 8c099cbf15e4bdf50b1268cbce6f50c4dfc54894a68bee6aadd7f31f0c754db6
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to obscure the ultimate destination of malicious redirects. The presence of urgency lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://asesoriagade.com/app/webroot/files/files/12886851965.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j5so74k0kfg5t1f0qn780bpfs2/1550086208.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d2e8fbca---xewazodoxamubapofivodenux.pdf
    • http://veraschwemmle.de/fckdata/file/71321289249.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/sopakiviwamomupolirij.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/vtv776cc78ro36qc5d7b946sc0/fulojigawuponibadol.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c761aa6a46---befifagumorusuk.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4145067cd6---jabunoje.pdf
    • https://ksuskalology.com/images/file/dumetedewakofewexow.pdf
    • http://timebymtm.com/upload/files/jopifidifosiwedulak.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/181cdeffc65740de54909e37cab3a35a/33992138886.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f08116b99e259272ed629ff9d3c106be/kojatizaxovefasi.pdf
    • http://www.ecvbrass.ch/user/web/file/zipafatezalojawinuj.pdf
    • https://marljivo.hr/userfiles/file/varosoduwafipisigifubav.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/973c54daedd79053e0ea116f55fd6c26/34401384223.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a535f6fe34451ade08a37e69eb4884ea/90465957983.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/87800788085.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2c3psmka1k0h2atgdmdegp24sj/84129699253.pdf
    • https://mvpartners.be/images/uploadedimages/file/85281158937.pdf
    • http://stardentalcare.org/userfiles/file/solaxuwukolapewi.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0e2b7b8a---neremimorut.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/17854e1fdba0be5f2cddcb59b17c2a7b/fonarewefeziperukaso.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/fa4f095881359fee3f92ddef2e41b2c6/63463840852.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sample+of+feasibility+study+of+piggery
    • 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_off0000f241.bin
7ff59db538b3e9fa6b940c5b69df37389b0f72472f66980c258c044aef0dad5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16668 bytes
font_01_sfnt_off00011d80.bin
44d2a1eece69eb30274aec70a1bff1e59d5c5aa42770c5222ca2716b8ad3f48b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 11164 bytes
font_02_sfnt_off00013726.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13726 16792 bytes