Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be10fca5c4f10ec…

MALICIOUS

PDF

88.9 KB Created: 2021-08-17 11:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d8951739b593633de6465e6cb9e8904f SHA-1: 9d0cbc824c5708a8dd877f8397749fca2e69cc6d SHA-256: 3be10fca5c4f10ecaebf923e9c67a6fafe4cf4ae32c74d8a740297067c9a4f5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external sites through a deceptive link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/70100136.pdf In PDF document text
    • http://cs-golfclub.com/ckupload/files/93212817351.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086e39e8c54f---61334844166.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/26139383020.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe16d5bc8---damaguxakuvonezukex.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc77eab14---gobam.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nirewezosexuke.pdfIn PDF document text
    • http://sun-tes.ru/files/file/wutuzes.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/jomana.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf8c1f106---86776605817.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6419b824---famuwumuxijajeluzetuwi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3b3d1023775438f9c4512ecd191e2a8a/70160950060.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062102333973499.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nked7js26rljaedkki3tn3uh53/51839257408.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610fea29a6284---nunoxajetibalefexowogod.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c17e525---roxiziwa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae01d914a---86754763627.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/96091712667.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/47033151439.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/87370991132.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/908738cc214c1ce2cab345ba1f65eb54/58972036020.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/60199337195.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae22d85e5---jewabelefafif.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/16536159854.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/40917387316.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/16628608973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+apply+for+walmart+jobs+online+canadaPDF 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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 11240 bytes
SHA-256: 533e0efc3d7e669dfc9651bf6d3dae2f439e9dcb2090d19d40af832775b8aaf0
font_01_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 18732 bytes
SHA-256: c76b74a048c2672955dcb4cf7c89d561247d69ef31d78574a6c8a3afd6f7129e