Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e72e378be1b4f3…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 19:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7f0dcef64962b21769c7877c54d6ee SHA-1: bfa0f21550415d0065c0c918e75563ce5c629f6a SHA-256: 93e72e378be1b4f359ab6bb4c054a00ce2c555a7ba362650e5e147dba387afd7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/27e4b1956087f1e692469ee68a50ca70/donugovokininakikolamu.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ccgd8hqsc207ubh9vjulbnau11/56844459487.pdf
    • http://allprintusa.com/admin/images/file/lafifeset.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5aa2ebf94---pikilisazexavoku.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e45ff40a67f0163215b9ebd8dbe8dad8/29033446325.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435b006650---filezefetarelup.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/57ddd05a4c155f53cf09bcd93f8a47ff/63164215944.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f9b70eaa4e88b03ad9174b153e029403/xofonapawezame.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc2a1affb---subabi.pdf
    • http://asirakademi.com/resimler/files/visotiximinovepikaxevobu.pdf
    • http://jaatkinson.com/userimages/bevawul.pdf
    • http://comp-art.ru/userfiles/file/79174739232.pdf
    • http://meble-tk.pl/userfiles/file/70927232254.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dh9i839aib9mjhc8hv6k1t2pa7/sozimibe.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c753c4d974d5a52d88a49baf1de266ed/80140162485.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vfkiu5qlf9uj59csg0ekfdfvm4/82585289535.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4603420e---85089089190.pdf
    • http://bociany.sk/media/file/gibodifowaradiwomupezek.pdf
    • https://topclassgardening.nl/images/file/sawonesajeve.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c781729090---8885326633.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/51573061493.pdf
    • https://accuratesearch.com/userfiles/file/poxipobedalepojexagifibos.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/nl2p7ic7meda5m4i2c7ubo4q5o/boxegod.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9njpa1f5bgpnvubdcup50sv0k1/juparusewezinerav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+cell+card+game+download+for+windows+10
    • 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_off0000ea3c.bin
c83a57bc0c0cbf31a5560694123ed5f19572d882a8a8719ceab003f4795275f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10956 bytes
font_01_sfnt_off0001037a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 16792 bytes
font_02_sfnt_off00011b8c.bin
774bbb604d250461696504b0fc02a2a54dad9e49999435aa56f31ecb3ce4c3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 16532 bytes

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