Malicious PDF — malware analysis report

Static analysis result for SHA-256 9664043e2c8b2cb1…

MALICIOUS

PDF

95.7 KB Created: 2021-07-20 10:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 480e4623dd0fc04a1470c596e6bb5679 SHA-1: 9188d538fb79a0261bbefe11ba3af301af70d88c SHA-256: 9664043e2c8b2cb16a88478df9ae05432d25ccc717bab8b32517d1e00754f126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://talleresjpg.es/img/file/90057731721.pdf In PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dakivetamedanawalajeva.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a4537a4b85f8f3c2b8cef09b83ea0d2f/tevutulapizexemuzawon.pdfIn PDF document text
    • http://asustainable.com/global/file/wuxojolomubiferukadoj.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d1669246---mupepamevidabogom.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160765d1e2d948---89647414373.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/kixofepomujezafag.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bb552bc8fad8c2d1892d0e22cebfb6e7/gonuzoguxipiwipal.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce15564e73---wufepokuxenadesigajed.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/figewemiri.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb684633e1eeca9685a3d324510b777c/sexovasevagafurukumaw.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d76de8d7---71101116253.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/bce2e2b79f3e70f8f438675dc35d7367/kopofupenurosexik.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2538cc4da3d7d73747bed9fda5de1ecd/17189356568.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/72969695586.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/14852378159.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/nekexozedasudepot.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/52826398513.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6a92f96b---bibobatafivixeferesu.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/28263027041.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c25a5d946---vuwosubuko.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8s52i47lqek8huok8d1g1d9n8a/64998783686.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25392f310c---pibilikorakifep.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ae8c3191---13893304031.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16228185731813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=permit+driving+hoursPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 17528 bytes
SHA-256: e56ceb80d2b3aa7689cf86d06f563e91be4230b76b1746fcf32b36aab4901bc5
font_02_sfnt_off0001585e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585E 10656 bytes
SHA-256: 7225bd4e0b53749cbf2657ba9528ec2da5883ca933a53a6bd2c213c11f825bb2