Malicious PDF — malware analysis report

Static analysis result for SHA-256 81024cf058dbe951…

MALICIOUS

PDF

63.5 KB Created: 2021-07-30 21:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c013a0bcb053ace595c678e5fb5e53c8 SHA-1: 973cb3dd8fda6f109e9c784595373cfae32b0473 SHA-256: 81024cf058dbe951e19197d22239b42dd397b24b966feb7b2473fa1aa12c5cce
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to host phishing lures. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i16ipk02vjdnsq4a2dv4jhhq7a/sijut.pdf In PDF document text
    • https://dolaodong.com/userfiles/file/motaxunijam.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p8l4i7ojmde097kdnhso7hv641/43106671384.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/16676780868.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/94956597074.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/molimuzubibuxomidopi.pdfIn PDF document text
    • https://wsbtitan.com/images/file/62958063248.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7b9b6eb4bf515d3dd2f86003c558019c/xagikuvajatijeguronu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373cbd8528---66223814164.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cace57ad---luwadife.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jewipofawabanonenawozi.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/vemagoxasenofom.pdfIn PDF document text
    • https://dineflon.com//files/23728127849.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e86a3dad5646d9a4010625d08d83cd47/xutubu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf4918262---pegifovipo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/99573354533.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/bifejatibenufobe.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3f23d7e57fb38c492562440727bf6df1/13737664316.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2903f0f59---nepizalowawurofuxidu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31debe5db9---rometemovafezonefatawir.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0bdc42e4498883df4bb5aad77523ed49/garetuxofurulaxuf.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/25657768276.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/62891076595.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zewifameb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=conceptual+framework+and+accounting+standards+2020+edition+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 17448 bytes
SHA-256: e3143206029787a10e041eb7418f5b61472dab0f37b382e8f4928606464df564

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