Malicious PDF — malware analysis report

Static analysis result for SHA-256 613ebb6b8ca8d6f5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 22:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2899fed97c55df1449bbb3daa48bd4d1 SHA-1: 18d8e263e62266df527d251c84b72507c7bec9ad SHA-256: 613ebb6b8ca8d6f50ed6928c303fdb0920f7bf2c2c065b53f4eab630fc53841b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, suggesting it's not meant for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=latest+edition+of+apa+format PDF link annotation
    • https://ladachess.ru/userfiles/file/16088545976.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/ruzojonukifeselaj.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/51242494407.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/tojebulafejepoxelo.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/52589509825.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/8080668730.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/50636084624.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210910_EB77C7F4B4585C5B.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98989065716.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jutovoxexasutelaxapaf.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/40381094858.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333a81c18bd---pefazepidadamokirex.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/zevoxirowazatefu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fafejuduzeri.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/87654539321.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/23341123481.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395c70bdf9b---waxevadovoteso.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/27969251769.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/7450750439.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/bivibozojodumuviser.pdfIn PDF document text
    • http://proart.by/media/file/57045360932.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q2kodoo9bqg18ha13i9r43utm6/87532408040.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909170416.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/matenixosafawuronutawag.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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 17832 bytes
SHA-256: 2a279ed95457bd0252bd2e102b13bf91a5293291575e49291389bc34c8f83ccc
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 10568 bytes
SHA-256: b8848c129d9bec1264a0e0df13cbc82c1cc8f97b0c004c995121c560a611da39

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