Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6128dcd7894eaad…

MALICIOUS

PDF

134.5 KB Created: 2021-08-03 00:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5a6df197fee86f928e70439eb2e00752 SHA-1: 237cdbc4278bba335015faf64fbc6ebfec0dc7b5 SHA-256: a6128dcd7894eaad222b2b517058fdbcbb288e2c68de596781e0cfa91d0051ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=nombre+de+los+triangulos+de+acuerdo+a+sus+lados PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc962253a00---xonup.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vkdmoc7uhujipggr27l5tb2947/4141888228.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/datamisevesavolovupuzapaz.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdec9a923e4---zivodefovoboxudedimiseki.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fb943c57022c7c12b0cc7c27b3a9940c/gosugotekumogibudenagif.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/dofobud.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s0kc4c10vpkmq68l8s4555jnl5/fewixesoviweveso.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/68215362764.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/81657701136.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/74246267732.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/32644050699.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/midawupifum.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210719111054_454930473.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/fujivonowoletomamuz.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/85624699524.pdfIn PDF document text
    • https://press-centr.com/images/file/37910503090.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/finulatame.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d5684997---dibodadadesetu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r1q0irer8idtqbmd8hejrvlseg/31022846068.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/watulibodozofeduxofadig.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/39847751769.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7207d1fff9---femivatarusat.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/09c0b5d09410f3fbbac097c80ed81330/rivawagepokosifirimarake.pdfIn PDF document text
    • 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_off00019c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41D 22976 bytes
SHA-256: 64674a17fe1479f83b149f1c6c3710a46ed1b16588272de8271ccfd931a8164b
font_02_sfnt_off0001f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F08C 10932 bytes
SHA-256: 337461d3f1e349de1373f267ae0118edde340819af544360cf06a24a35d1f242

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