Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74bd2dd2302adc7…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 16:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af2ac175eaa40825eac5be55d486d4bb SHA-1: 39afcb7e37e712c78bbacbcb13434df9c4df132e SHA-256: f74bd2dd2302adc798de1b7422a3652de3f210c3a51807e4b9382444d039ce73
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to potentially malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b369a63114---72633033210.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b1b6147f---tokubikatanudurox.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/gunamakataserafowowa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3vlfh3pi85oabht01rdkqm5fng/21291390574.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/37971331482.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210617_074851.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/90040495843.pdfIn PDF document text
    • https://premium-house.uz/images/file/figadulirer.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/41926390636.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/68565389570.pdfIn PDF document text
    • http://jump360.co/upload/files/20210624161509.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/18506710226.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ce8ad3bb46f03cb63e94e4c61de2bb18/86217913807.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/47811626945.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608504be76f81---rivejewerofole.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/65076646743.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bd021bfbce9a7dbbd26d3b06ac06f34c/77448044323.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/sidanunogosireloliwab.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77d166be5---27267160750.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094936a55d20---zozavamowom.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9420e883e---maxusulumenag.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607260bf02837---2519078588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=current+medical+diagnosis+and+treatment+2020+pdf+free+downloadPDF 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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 27380 bytes
SHA-256: 1736ec0d8485269da09834977764d57b17b92b3707ebb0dd4cfd4c80964e719a
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 11424 bytes
SHA-256: 324559f0184c970c11e97d2bc82a28a720de07d3a34a57b41f5290e6c571dbfb

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