Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba627ec5c9ef11af…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 15:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4556c1d10e8fe95d4aedf41ba95ad37 SHA-1: f40dbea60f290b847707028d44b6dfe51af2c8c1 SHA-256: ba627ec5c9ef11aff4a9a87a90bf44ea3897c4f32c8ac2652305ef4c5f2554d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many hosted on potentially disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the URLs point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cdmsig2.com/ckfinder/userfiles/files/85935575130.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/76472828597.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/vivibadebojozizuwufikugez.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89be2cedc---razajewaludetepatawaw.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/88498538389.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/39098257668.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/vezolotabosopubasemugut.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/23510863106.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/jawifo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e27104b1---zirujukuzunaguwuzazapenu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2de7767f3b39a6f441bbd144f53cbb80/49161960743.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607586f003e07---posunalosisonagefedeboluk.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/19009700458.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rlqst72ppm0ltgcvedremotfo6/nerilefadorajegiduz.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gadodenutepukisonegokuti.pdfIn PDF document text
    • http://royalgroup.at/tmp/livezituzuxanigowox.pdfIn PDF document text
    • http://cartopack.com/Images/file/fomelupirebavaf.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610ceca0bb13a---59589168213.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0k6ne58n6m2d6ad6mskjpe9rd6/bedageromukireganivi.pdfIn PDF document text
    • http://stonebreaker.at/pilerora.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/laxonimebim.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vubemumif.pdfIn PDF document text
    • http://ashioke.com/images/library/File/99377255598.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d09751bab31245294ee287528be4aaac/vugeroxumaxedalozebo.pdfIn PDF document text
    • http://mariancozma.com/_user/file/51803902507.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/76636482345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=printing+double+sided+excel+worksheetsPDF 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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 11008 bytes
SHA-256: 74da91a69dfaafbcb3f708300aa2e7e0a14ada8730928990158c32c98a0056c7
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 17620 bytes
SHA-256: 60b7507c6893cd9a7e7908a40023572dc3c2132c51bc448948be7032fb0d6df4

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