Malicious PDF — malware analysis report

Static analysis result for SHA-256 7793ea7cf2ac6aea…

MALICIOUS

PDF

82.5 KB Created: 2021-06-29 11:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01d8cc4f2a7427318ab3c85ee2ea4bc8 SHA-1: 66e0e483fc2577cbcd15548b225c7edaa31d5f8e SHA-256: 7793ea7cf2ac6aea059b867c70c949b8b8e9870888f8f4c37f40801d5a26eed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests an attempt to disguise malicious content within legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86c797ba7---59099404796.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/64815e44390ed2bf5a0085cd31c10466/83935541415.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kfhhe8416rc43o0k1c24j0q041/83027300329.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071712072b52---lodawujufitakesiperiwe.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tsp8c7tn18945rue2r4a499iv7/63982382438.pdf
    • https://aonetreks.com/uploads/file/kuguvafeturotavukumafirox.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tiripexipu.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff5dbc2cf---68251783831.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210609_47F5F4DA82D6829B.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jcrfm2l76ob24b3ngjhoje3d63/rubesezefobumufap.pdf
    • http://dailyxedayhang.com/userfiles/files/54699538027.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed375625b9---sapakojufinajojawufibalo.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a05a25db8de---gesumususixaxabovavem.pdf
    • https://allcreaturesinc.com/files/files/28708864092.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ffa8f41aebc9775c542d37264a7ed098/nakagali.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210629_E58245E7583C9563.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7tn06v6nh95q7v2fhhapfhb0te/nuligoxaja.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a8f28e67b37f8bd30f2dc48c0f0056de/28876946800.pdf
    • http://security-m.jp/tool/images/file/43346472477.pdf
    • https://vicotelecom.vn/static/source/images/file/66840437540.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//bodogigek.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3f67f1eaadb1a5e9cc7604085ec85458/97592267719.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b349bb6b80c---zosigirezes.pdf
    • https://sasalidayanisma.org/uploads/file/39852549369.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c5347703021---vowuvelofe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=0+is+the+smallest+rational+number
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c703.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 16252 bytes
font_01_sfnt_off0000dce4.bin
7dd6067b7991347d4c312d4769d1d20b256d772bb0bec9ea798b83f3047ba957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10640 bytes
font_02_sfnt_off0000f501.bin
4000d5adf144650dcc824d9f638ef4bbe462490ef9858e06c48cdc5c7b352e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17220 bytes
font_03_sfnt_off00012221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes

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