Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7f10d6d7710052…

MALICIOUS

PDF

66.6 KB Created: 2021-06-03 02:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6074c67561b300057993eee403288b SHA-1: e47a8f418bd3142656715d4f538da8d65ebcfeb4 SHA-256: be7f10d6d7710052cd193630d98fbd706748a6ac7d36198e4d8ed33414c5c475
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious links. The heuristics identify it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO poisoning scheme. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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
  • 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://firmykominkowe.pl/Obrazki/edytor/file/80258385209.pdf
    • http://ylgems.com/file_media/file_image/file/11239510663.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e81fd1e315696611cc84a79cae92dea/wojorepivusojodaputopuvit.pdf
    • http://aylincinarli.com/fckfiles/file/kixotobowisavuwori.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae5c354f5---sevonosebigufojoboxiviram.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2391b554---33225620122.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5kgjq3l3lauena5s9dqk5vfd30/42753572811.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/55f8287b718c434b6b1149e916f4ecf8/53472840094.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5c17bd88---dinadixixiguxoruvugiga.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37963af71---5579816403.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/92462811fa9ad30c949bd12fe6b956cc/kupoxowutam.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896d4626107---31934236713.pdf
    • http://clarksville.net/wysiwygfiles/file/bijebolutorepa.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a089f56fe9b---27713006668.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160789c68c4722---68111043380.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/983bffdd3d1076a7a1e9bcf9ce0dcc5b/36026059068.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/etjuij0t7lo6bvuqdd7gogsina/mujamabodoredexirolap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cours+de+phonologie+anglaise+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3fb.bin
7f0c006f373563f47321589d64db09e54cefdbb1d440ec50b4ea0eea0dd3a0c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5208 bytes

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