Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9e471deb186c5c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 16:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9457047bcd7b4fb03e6f9ff02d9c1ec8 SHA-1: 81dcf0846fefe668ec67ef0fb8c95d1af5fcaedc SHA-256: 2f9e471deb186c5c7424d8b0d053b7a6f1e4782bee8a3281c52145bfe0982ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/84e5822583a201f3f8ea3e42c7dc6420/29302502236.pdf In PDF document text
    • https://granitabrasive.com/editor_up/bimuz.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/84991760458.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/fapodumolusafisajedafozu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23ca31474---nedolagiresekojemove.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f975ab7508---80751014698.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f987b4e7---gopofupilejesak.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/55396260547.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/dadopupotakuve.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd7635c4a---44680059761.pdfIn PDF document text
    • http://ahchala.com/img/file/luruvawizipo.pdfIn PDF document text
    • http://ropesadventure.com/d/files/32090032483.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xivogaladagujes.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/7pcf0i336s6j9b8ch4ha1qr03c/kefekixomuvejake.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamilubujeverepigadakef.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6623fmdfv7r36fe960h1md6rmp/59439634890.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/52619511811.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4533c1ae9a---tabaz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/83f7560a27c526e9df9f27f750e2c158/61647116804.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/xafenilirasaxilimib.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/88219b73290eb6d7021a6a9d0a066492/28893484673.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/nozuxujagojezogotuduvo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075322e20f75---84677778338.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q9skq52cgvlvr9ivu1btta7ggf/84843037534.pdfIn PDF document text
    • http://evola.it/userfiles/files/mexolubidiwakejanebofovas.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/bifotumujibapad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=glow+worm+flexicom+24cx+user+manualPDF 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_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10924 bytes
SHA-256: 9891cb096a0fea52f0a4c5dec1bfde62b1eb1572b2a7dd48856eddb72f760ca3
font_02_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 16904 bytes
SHA-256: 19aeaae7b87a79c4aef613b4a2b81d247068b2556fedc6e78a15322f41d883e6