Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab1f02be95cb6c8…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 16:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 919b991c9f562a717d16645014b351be SHA-1: 22c5b34b5172e70b92005cbda2764d82a8e67031 SHA-256: 4ab1f02be95cb6c8495d653f2174c8aaac6a5dceca6bb9634c5217cca70f9516
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9bcb67503a0f85dcf24de11338eda17b/lemarerapofasaja.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5e5e8832---vapejug.pdf
    • https://nanyangtextile.com/userfiles/file/79241530016.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/37dec206c2e56ddf6cdbc5046a2c7263/64378188528.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998c9dd9b22---kibopav.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/btc3a6s16jcv2m8u8eua3bconb/77622749544.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ee70e4488481d3c3ecc76d4040886fb/52808139643.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc60a330f---4338302800.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609707f7baf6d---26306770434.pdf
    • https://datatech-int.com/userfiles/file/bomalop.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/26484050115.pdf
    • http://rustproofingottawa.com/userfiles/file/jopavakimugopanomer.pdf
    • http://angelsstaff.com/uploads/file/78237029415.pdf
    • http://classiccar-jp.com/js/upload/files/bexegeposulizowu.pdf
    • http://bethanybaptistcolumbus.org/clients/75549/File/62566476123.pdf
    • https://alnahamgroup.com/userfiles/file/81654835026.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f5qruv2ll6qdklvv2p4kongtd4/56141923962.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+page+in+acrobat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ee.bin
2ee4119ae5f870a1db57f2b2ad510ade93a307935bafb99a55d8212f7799ea38
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 23440 bytes
font_01_sfnt_off0001151b.bin
cdbdacfd749793773385f0c3da14dca50c6c8dcaeeeef785a14e11e489f28f33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 10784 bytes
font_02_sfnt_off00012dc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16792 bytes