Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b162663b39039d4…

MALICIOUS

PDF

85.0 KB Created: 2021-08-21 19:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0174876f814c7189bb9f9c6cbfee41fd SHA-1: 6b823b9009a6579848083333af6db0059534bee2 SHA-256: 4b162663b39039d4fab52ebeb0024f09480e04dde357dc1dc777d5651366edac
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://garglob.ru/uplcv?utm_term=cricket+score+sheet+word+format PDF link annotation
    • http://vom-ragnaroek.de/uploads/file/3913418418.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a72b4db52---44354565055.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/83857710319.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084a33cb08b3---50602481722.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80f0e69c7---48545470658.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pefupoboj.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094ec643a1---dojatuvusegisiwa.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/sujawuberojokave.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/manegedalif.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7789f5f7---muliliwesatesudiwilim.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/tewimo.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/3178357169.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d293dbd6---levuwefatafubifotesuwo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c180441c9---95119113059.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/susujenivelu.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/zanevo.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/ruviruxajolaj.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/26183314676.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jabiluwosujuzorij.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/13084309980.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/212594121.pdfIn PDF document text
    • https://camelcarpet.org/d/files/dovuvakomeruwexuwomet.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/28605489182.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/fakotarunokujurilujun.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/58943536241.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad92bb7c2---90575502026.pdfIn PDF document text
    • http://kunbot.com/upload/files/73653307314.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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10800 bytes
SHA-256: 831a16b0c0b1ac6f09beec42f0d96b528e20e07078e4ed62ffb8ce3dfb0a860a
font_02_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 16752 bytes
SHA-256: 9b0cc5bf7b18673baae56ea43288d484fb69d2b72897b05ffb137943712ec6fc

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