Malicious PDF — malware analysis report

Static analysis result for SHA-256 157d3dcb2d2373aa…

MALICIOUS

PDF

83.2 KB Created: 2021-07-18 19:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b988ee21bfe6b3bab37d33bc8b2c174 SHA-1: 71372f53219b561c55976b9d545dcfe240fbca1a SHA-256: 157d3dcb2d2373aa2f99062f721706ebd819d11d047b461816009763e7b3efc3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam lure. It contains numerous links to disposable hosting and compromised CMS uploads, suggesting an attempt to distribute fraudulent content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://linkingpeople.info/userfiles/file/37557537043.pdf
    • https://zapret-rf.org/web/img/podborky/files/gebigojuxir.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb63ab7ce---94397013650.pdf
    • http://ingfrimale.com/userfiles/files/repebosuzudatasosopew.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a48118156b4bc2bf9964f126fd45efd6/91434371563.pdf
    • http://bunny888.com/ckfinder/userfiles/files/73974969134.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71a06c454---tafavokopa.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lalebebina.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/7056626215c80cee8ba82459b2de237b/jumivakodozixane.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a927499aa82---10655873664.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded50de3d81---20706828147.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/suv8oq8bnpvc1p6jpvdklnb1d5/15904022413.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3848b8sddn4iq5o8hvf15uvj9r/verejar.pdf
    • https://tl-systems.hu/files/files/zejipexe.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210621_7606971F87CBDA16.pdf
    • http://i-daa-wl.de/userfiles/bojaselevizanu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8713a8f122---zegoretetelolalananowuso.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/253sljbp4k612kmnob1dl10okv/jemupasero.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/oobh68ftp7pcstf5rosacndrii/wiwafedaragep.pdf
    • https://jungleflightchiangmai.com/Uploads/files/fanepux.pdf
    • https://digireg.cn/upload/70568878344.pdf
    • http://teifsepahan.com/files/file/40089249528.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=polygenic+and+multifactorial+inheritance
    • 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_off0000e484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
font_01_sfnt_off0000fc9b.bin
b3c91fc31cec33e085e10be9ac62fb2fc4e1fc0a5cad6e7aee24d971b6072861
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10968 bytes
font_02_sfnt_off000115b4.bin
b0ed4e32d4a04d4d27a584e1f14ca4a4d9aaedda2cc82d615db2f14feea3aeab
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16328 bytes