Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6e7d871e199f60…

MALICIOUS

PDF

91.4 KB Created: 2021-06-28 22:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f5200df9144383ab39a57b4ade82ba0 SHA-1: 0c8648f6767a78d24254208a07b8812f8f4e9d74 SHA-256: cc6e7d871e199f60f7c720a550991d20d51da0a9a153cb4807d4c33f81ce2276
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials. The presence of a 'password-protected archive lure' heuristic further supports the idea that this document is a precursor to a more significant attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160759433021f4---jezidugosukejagoz.pdf
    • http://nowyhotelik.pl/userfiles/file/53062959725.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf0537611---59834049864.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3245d7fcb---detevufa.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9145fc7f---32389280898.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2ihdmfhkoor8uq6jnibf9udpii/lavajeroj.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac599432c---femejexitune.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f93cfedc---mawitukuparikanezose.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ad974c0c7e7c61e3ae2322ddd58e2afa/kakanipufakikerema.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fb6dbdf6---28760597578.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/39620007667.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6c4cd4e3---21834811003.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/14eaeb7f8ccb61e168f9e77bcbc68e9d/guwisubobuvutitem.pdf
    • http://netinflux.net/userfiles/file/garimupoxek.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722952f8e3---dojojexosibal.pdf
    • https://dukra.sk/editor_uploads/files/jawagizipilozalosupemeza.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d344a5f496---17833100957.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c257d071abf---pazozavorolitutelade.pdf
    • http://bukharageorgia.com/sites/default/files/file/xigosebipelesopapu.pdf
    • https://alternatifhosting.com/calisma2/files/uploads/38848243504.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3be3b4906---jozexomabureru.pdf
    • http://charivne.info/images/file/bigixekomufumatabu.pdf
    • http://beautybybelief.com/admin/images/file/35384366490.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980b2bdae26---porilopugomurefugad.pdf
    • http://archi1919.com/smlclub-files/file/62752525462.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=larceny+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ec8b.bin
1ecfd59bfa64e771f844b4e4dcf5a104124f746434bb3c8f8b3ca8812cf7d36c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC8B 17164 bytes
font_00_sfnt_off0000d47a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 16792 bytes
font_02_sfnt_off00010582.bin
bd012945f229e0c94100020e5f000dc49ca4f89544c4e037a6796663c03af856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 22216 bytes
font_03_sfnt_off00013df3.bin
f41174cf237a0616e54fac6e9af60b665f49294ea78cc413c32da2c3d3a9ca8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 10528 bytes
font_04_sfnt_off000155a5.bin
130594af92fc7cbf26d22df0226ec0b98ec5e1511a66ea68e5e73f0e57930886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 2104 bytes

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