Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f97da7aef547db…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 18:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fb5163529bfbff3f56164c2b484e57c SHA-1: 1c1c9e79a9e0e3fdffcef726560ec86d9f9d2e3d SHA-256: d1f97da7aef547db80143ead31868902593298d627a6fd740d19ddcd7fd8ac75
124 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories or disposable domains, indicating a potential phishing or malware distribution scheme. The PDF's structure and the presence of multiple external links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

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://chaitraglaze.com/uploads/xafarupidafe.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de20992346b---22343915943.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/zeluwevaganosimidoz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072c386a6fb5---zuviturana.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/lululamokakezifosewe.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/fujizexopusejo.pdfIn PDF document text
    • http://szm.hu/userfiles/file/logekulafuladujorositaze.pdfIn PDF document text
    • http://lblussana.it/images/file/vefomopa.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/67635194491.pdfIn PDF document text
    • http://ossokahve.com/upload/file/69071896135.pdfIn PDF document text
    • https://mobilityservices.it/file/26945480588.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/261906a7117cc09744f53c8e5f6f61d0/43170670110.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073b22dbebff---68097815715.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/60773155564.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/19916165120.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66fdecc4b2---purisedonenil.pdfIn PDF document text
    • https://xigmatek.com/upload/files/32314852645.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tonemozemagitifexenebinif.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f22ecf026---divafajigitimazekibi.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/33829067230.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/nunafovipotezarivatev.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd490d1ebd1---vubeninamemipukusimof.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/rozenopotugukelagoradi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jodijamezikirarogedaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=operaciones+con+numeros+reales+complejos+y+expresiones+algebraicas+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 18836 bytes
SHA-256: 29fd286c02acfbd5e20485ccee23257794408ea1b79a93b2fdcae6b37d2c4324
font_01_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 11476 bytes
SHA-256: 74f3cb30447799a5e6341cda2f47985dd34cb463b224050edc01d8f3a3bbb79f

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