Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f2a2ef41584faa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 07:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 158f8ed422072ca316ca0cfdb7170f20 SHA-1: b908f20ae13f7ab666d5ec3e6819aa87003cfcd8 SHA-256: 27f2a2ef41584faabf07376fa9ce4a47a3a8d7ef618c6a4ba61ec562f07239a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3cd93677---67902358634.pdf In PDF document text
    • http://tk-weld.com/images/library/File/ligix.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7g93h3d3442osa8h3q16u16n8c/kesaximevudopivalelugifa.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/36820387635.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/789ffcf1a9c1667fe340e9e7d8dc0cb5/kelex.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/96493950772.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/22799774613.pdfIn PDF document text
    • http://bdsductri.com/upload/files/telejitibovoj.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fowedapagumidurixotowoza.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/79212189457.pdfIn PDF document text
    • http://venkateshservices.com/uploads/tivazokonudurobuwapozaj.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/78154484828.pdfIn PDF document text
    • https://vzglavniki.net/data/file/fosefamefinawag.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/dusujovomogure.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/12569052590.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/topukalanomasoba.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/44714606799.pdfIn PDF document text
    • http://scarpatti.com/files/76484514828.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/44466935992.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/75313587575.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/56520594854.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/sivugijakevuleditanonixix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=routesy+for+androidPDF link annotation
    • 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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 10560 bytes
SHA-256: 743832a20d260330b6993ff68cb29d71997fad2f6f2b5ff84f9127abd4d2f3f3
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 18376 bytes
SHA-256: 6b2565dfbd314944f36306a86b2d5d05e7baa36703ab23d066a5db1da1566123
font_02_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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