Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca7e23a71eb08be…

MALICIOUS

PDF

82.1 KB Created: 2021-07-15 10:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c85b19fe220940bc2a63f1a080730434 SHA-1: b79008d0a283c197bee80a564d3c82bfd5afd3d8 SHA-256: 3ca7e23a71eb08bea17b8aff2d09b4ff359babb44a3f89ce89c5d9bc6b2f16c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farms indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=negative+and+rational+exponents PDF link annotation
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/acka4ibppe49h92di9qrc4n740/35390480360.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/37403093598.pdfIn PDF document text
    • http://mobiliteit.nu/files/72972744221.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/40178216053.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/50433865031.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/73311972795.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c9ce4e200760b8e939da769a07fa59/16555083958.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/bobapulojijudirij.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d3524d810---xelutovusojuwumepoje.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/10375923352.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/79206321624.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5310c449---tosowopiw.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r9u5ssr9tkk05hg8648dhdigv0/94243092856.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/40bf5a5db0965314be9a5be278814ac2/27068584902.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/679ceeee53bd0a4b7e0fb7a9511437d5/36578382855.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079c27e9065f---tosutimugadatudej.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/10345146357.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5c4dd021a04054afff9295c98cbdf3c3/petijuxos.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zorizuwi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c1ef69cee315690089c5b867c46b50bd/jakonavanegufololarawa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92f6cadb1---bomekazoberetademesi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/rakozunutali.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11a87d0d5---dejeweregubipejafuzi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af80e9e5b67---42120898293.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/kugomevexidogadezusosode.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/87992811098.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_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16372 bytes
SHA-256: ae2266b1d4ab71ab48a945f837c4a02fceda45216bbb3e1955f664326ccd7f90
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 10712 bytes
SHA-256: d1690d936e6c82b8433f0dace58eacc3f2346c1ae5d558baff935f5ac896d927

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