Malicious PDF — malware analysis report

Static analysis result for SHA-256 8234cb408ff45e45…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 06:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d9e53a4e25da6e01946e1b233171ea8c SHA-1: 1113a48635128ed7100561f79c2aa17d52343af2 SHA-256: 8234cb408ff45e45edf9b9f8ac8d478e236bab0d429c8b68b63bcfd922791c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=raze+3+unblocked+games PDF link annotation
    • http://internet-trade.cz/UserFiles/file/jeladozinug.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mivazadazinafumu.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/85716405233.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/wusigaretawoxu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/93538440320.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/13985257492.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146277cd8850---mukefokafarepilaterajax.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/632c1185c4c0a44a483b78a99ad2c051/80976083499.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e0a02795cead3fa911cda5a7816bbd9d/limepagalubixekim.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/24693156784.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/xibusakex.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/vuzijuwasotevutudadanuru.pdfIn PDF document text
    • https://coil.hk/upload/files/wokaditutile.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/57283989336.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/mefefafifesu.pdfIn PDF document text
    • http://4yoga.by/pics/files/64012819483.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vefofigavokuvukefu.pdfIn PDF document text
    • https://securitydm.com/slicice/file/70704480415.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ralivinarosenipeno.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fajilibugeme.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/16430792592.pdfIn PDF document text
    • https://casaalu.com/luutru/files/ninegurubesapu.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/watesubowe.pdfIn PDF document text
    • 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_off0000c287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 16396 bytes
SHA-256: 0af1824204b0ba8445f643b66584b669f1ccba2a12703d7b8ee7dae48de9aa00
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 11032 bytes
SHA-256: ff233e07951bd8974caf77265501cde2ebdcbc85af4c963283ddaffc13780d94
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1