Malicious PDF — malware analysis report

Static analysis result for SHA-256 af608312dff24a5b…

MALICIOUS

PDF

85.9 KB Created: 2021-07-16 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60c9ea9d26fc6add3d1cd51ae4a5d615 SHA-1: 07459240aaac8d26bd69e7c7eb7450070d9f9946 SHA-256: af608312dff24a5b688af71523220c94274426d90bf168d500cdc6fab3b655ab
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves a harmful purpose. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or redirection scheme. The presence of multiple external URIs and the overall structure point towards an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jkbprivateiti.com/userfiles/file/forowatakeloke.pdf In PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7f727127fa520e568224e58dc3b73923/tojurututuvenisibez.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/unvv58arrbd7i15r5a47d1qgvq/kenopepipuvizunikuduwuben.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/26749081634.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160968e2b016ef---bajodif.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210705_57981382FAF790EC.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/28996834549.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c84c4b8c94049eb95ed9461a0d99ace5/7306815731.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c8cc9260---37888673676.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/32720236437.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/99459444993.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/86547532140.pdfIn PDF document text
    • http://industriameccanica.it/file/45161212937.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/wiwutavaxadojavefoviju.pdfIn PDF document text
    • http://mayjack.com/upload/files/54041296846.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebf4e1224---jugasidapenurekawo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c542a499fbb---vesejolaken.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad77800c2f---wofizaxeninobo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c48849924bc---timigubekagajarutubemudu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0caedce9---59349312096.pdfIn PDF document text
    • http://berbun.com/user_img/file/motukefuwojomomowosi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791283f41b7---32730867300.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/afd8fff4c1c11689b2a45a2c68d38b2f/27466700762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=coulomb%27s+law+practice+problems+answers+with+workPDF 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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16656 bytes
SHA-256: c2e6aa450bfadbfcfc55a1d5465fcc5364c142864fe89b1865fbdd3f5d3296d5
font_01_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 11120 bytes
SHA-256: 536d0d126c82d19539de21354538b25d0f1bef5621990e4defd1bbe65c1f686c
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1