Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6d1e18a5d062d5…

MALICIOUS

PDF

92.8 KB Created: 2021-07-23 10:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bdb6c9755e93c5cf0f3df2b55876f69 SHA-1: 4e832c5ec39ecab15fd0ce8aad6b47ac3340fc2b SHA-256: ab6d1e18a5d062d5ed32ad0d6c45cd1a532b021c39267f7976a1f70d50cc28fd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7edd35ba6972e191af2a95265e834cd0/tamenaki.pdf
    • https://ludifrance.fr/userfiles/file/70939886926.pdf
    • http://medica-eg.com/userfiles/file/voxelawabefaposipu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafe747722---fujosurije.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g2ergoq7imn8no6f3fpmphb362/61687854180.pdf
    • http://vizit-k.net/uploads/editor/files/83262254030.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26a2dd77a---gitebore.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780214ca503---pebasodejetanurif.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e46rroivi2ma0r5kaaqtpajrm/zadukesulurevimusum.pdf
    • https://jambukuning.com/contents//files/voforilidotavetepunut.pdf
    • http://avonsteel.com/UserFiles/file/sulowitigemefedu.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/95e4073159edadb4d1e05ed70f7a8f9f/91540212819.pdf
    • http://0-50.ru/userfiles/file/rimoxaxekikogir.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/94104541848.pdf
    • http://elsekmont.eu/userfiles/file/wimanezogu.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7g12um3qlvjch1p32jdmm04a9c/43794740608.pdf
    • http://drapa-technika.cz/UserFiles/File/30006883364.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/77e7770378c7357112184887b9ad5f5d/22851373983.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfb303251---99189306662.pdf
    • http://auchli-appenzeller.ch/userfiles/files/joresexut.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7539969787---vosusasuxivuvebikimoxi.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2006595882---teporelinolizopoz.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080023397198---85372805067.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d3e9b38bd6e592167878500f23d56871/zisevakigedofewu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=english+writer+hornby
    • 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_off0001052f.bin
b142a30feaaf2d6a3cedf8ba749e4911cd0731d824e09cec56bf3688b2f20a45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 18276 bytes
font_01_sfnt_off00013463.bin
9a206498f337e02ce41535140919af1ddfcd17199910109ddefd7a79d1cd78fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 10548 bytes
font_02_sfnt_off00014c6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6A 16792 bytes