Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c841eb90f2aa15e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 02:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08a09e082aa5f9811c35de3a19ac3d9b SHA-1: bc0331ba3dfac934c077dd5793f3e8a4d6edfadc SHA-256: 9c841eb90f2aa15eab7405719f5ad46647dff3b279e4d8c6aa892299804a8238
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple unknown URLs indicates a potential distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9759b66a3---zulunu.pdf In PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vaweweretixevezezafubur.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8be7853c830d50af369d43fdc5f57dd3/60629893038.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t2aodrk19fol5eocosu6g2gkt3/48392692406.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5d1e445d---fabutolalimajuxadojuw.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/bofuwaxugomipexedisoxetu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/84845490931.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kunowolunoduv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b289ab255ffc5dee7391ea4f770fca0d/637528710.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/14767602542.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/5530318575.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/ligonaripusufeliti.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/muxemimuru.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/niwogatononodepufoxexilu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/37108002996.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/71132955181.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/nadipifekifawubumupis.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/libebapetubaxugewerug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/949ec96f9a0bcd55154f32880c9d8e8c/notibatejun.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/236m44rmfmsbq3flrk6bnviapk/51361941174.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7e43aac4---79951368300.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da7fa0dd3---87355514344.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/73037844278.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/60842711782.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160786ad05606a---44132014458.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/nafavibilekozatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sacred+geometry+in+nature+pdfPDF 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_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 11040 bytes
SHA-256: 6c73f2de551a9d8e80d1672dfe08e86dfcc4957b443e5e738c3f86c0d54cbf49
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 17208 bytes
SHA-256: 88a36ced307e9692d6620b5be39dcdfa13719462a4dca0526e66e97e1487b18d