Malicious PDF — malware analysis report

Static analysis result for SHA-256 9358abab6ee492f2…

MALICIOUS

PDF

92.5 KB Created: 2021-06-25 12:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 538367b5b92ecb369bae72a97226c47c SHA-1: 7b45a07b8ee4e92365dbec60e5ea9491775323c3 SHA-256: 9358abab6ee492f2dce6140dc62927769634c1cf4e86d1319ce181e711eb2354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=word+that+matches+the+definition
    • http://thankschicken.com/uploads/files/zanewawavutas.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/dudatel.pdf
    • http://clubselectionvoyages.com/images/file/lazesidavetugalumokajasuj.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/dilizofatujozij.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c832c265da---leduk.pdf
    • http://guchenes.com/d/files/tadebewewuxugizitotaxefif.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c540b6ee1---91627070301.pdf
    • http://bakoca.hu/files/file/75436711473.pdf
    • http://shreejians.com/userfiles/file/672216107.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c48fd1ce052---jipogidebobo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3622e95a23eb526fd9cde3d3c69b95d0/mazilanapazalexede.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1knmirdmsv10suvn45137h4e26/73247818640.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/82979779228.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c4da3d4cf3a7a6d01f47c2b84113d2d4/pomenolobemokor.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098751162e30---88303011846.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000146eb.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x146EB 18328 bytes
font_00_sfnt_off0000cfa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 16792 bytes
font_01_sfnt_off0000e7b5.bin
2316afb283f90fc082096b7f1d6da9b1f518ad666e431dbb4f7510012dedafd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 23260 bytes
font_02_sfnt_off00012110.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 3464 bytes
font_03_sfnt_off00012e90.bin
88fbe1f497fb846b34725866b8372b819e596eb7defb54777f9746c5375a0f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 10688 bytes

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