Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22b1d49ddbd0d19…

MALICIOUS

PDF

75.6 KB Created: 2021-06-25 20:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92d9940fbe038d7d1bbe133d27d96ef4 SHA-1: e4abe5505e6b8eb6981102a0d4668b37324b6e7c SHA-256: a22b1d49ddbd0d19425a4782503d6adf169c523e017b78f11521dd3cb27d63fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=sore+back+behind+lungs
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd388a29b6---730398620.pdf
    • https://stef-nancy.fr/upload/document/riwewisexefin.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c328bb8a45---50111208961.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c57c0659d2---fomomot.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/58322c5a483771248b27f4178da4c0c0/bofonojibizovajanasoxigi.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c5b7393d813e52e17f5733b3029c7a3b/zotezafixotogew.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed4cc124c---jusorenuzatepepujovaduf.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/68154881212.pdf
    • http://bebelino.ru/userfiles/file/32771080077.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1en5bjtupf8uhqdb1h2318mins/98721643317.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/xinadugiwukidu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7132af3d---84142480370.pdf
    • http://csc0898.com/userfiles/file/20210621220839_9wmxgd.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519070040183007.pdf
    • https://hogies.com/includes/template/uploads/file/44193431306.pdf
    • http://ahxxzx.com/userfiles/202106/file/tazotogezejepen.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e3vljdf9a69dvkvt716391r5r1/87234778491.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b6c865c25cade87b98995332583710b1/8780616980.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d875df3bf956094fd55542f9f5061cff/75113342485.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d4594feb---44093642652.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afaaf79c2b2---vuxuruliluvaten.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec593c6eae---xibepokasubesepe.pdf
    • 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_off0000c4fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FA 16792 bytes
font_01_sfnt_off0000dd11.bin
31a9a8849c3227080f9308e4c3e102af5439bffbfadb6af9ebd60a76abf3f108
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 10960 bytes
font_02_sfnt_off0000f61c.bin
dd03ab6899d3916dd7b29ae44763f3ecaa719d735a09b65214d1b996a8c4b73e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16120 bytes