Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8108bb5f269ce18…

MALICIOUS

PDF

91.4 KB Created: 2021-07-06 23:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9358d7e70d9d6327d630dcde8ae55fd SHA-1: e094062403e6062de7b2a29d2f88e2b5c4bd43ee SHA-256: b8108bb5f269ce189f41335ba0820dba98e0fd41a08ca964305a822a1ad8c9a2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting a phishing or malware distribution lure. The URLs extracted are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1153449ddc93dfff937d6a1102c521d3/durexozukomoniwutanusa.pdf
    • http://ahcxdq.com/uploads/file/050435422884.pdf
    • http://abc-tel.ru/data/File/jofuramipowaleluwox.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/25fe0151e4bbc070f5d88ff73d41693d/85216649359.pdf
    • http://teerosy.com/ipp/images/uploads/files/somumikawutupofijogoxa.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j6mck6cnmcu6cdf3vd9iqietfo/667153773.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608021adda1a5---rogimovividebixamone.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098c311f2c12---36824060612.pdf
    • http://www.amedna.com/userfiles/files/bipabafobidutitumelidoti.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33d8caa160---91702699608.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/nosofuwesalujuxuv.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0c963fb3---vewovinujewa.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6bd27520e9a1c5ea3aacc764f632b875/92094428323.pdf
    • https://247hvac.ca/fabulous1/uploads/files/58535641415.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9adbc8ed8---poganatosibedatobatimuwo.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c0db5b7d---78377695778.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9ab7b320---17315763489.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdb0d47b96---nufixumefokul.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/38gcgo3gs8v6oimqgb27g3bp5n/44975937289.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076079342d14---sekijutesilexuvepusubix.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/nuzozulujibevewegidovev.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/37r5g694luc0210kd0dktbl5r1/70045688033.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d2237ff4---48028086393.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c19806345---97097694481.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=electrical+engineering+books+free+download+pdf+format
    • 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_off0000fb6a.bin
e06f903a990a79b4b57656dc90d601c7d25a11118ea6eb8a620663e9d3321bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 11264 bytes
font_01_sfnt_off00011577.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16792 bytes
font_02_sfnt_off00012d89.bin
78d2851f75e388d6c669f73dcf0c4273fbf1d577da27fbff0fce00ba1ca06b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 18396 bytes