Malicious PDF — malware analysis report

Static analysis result for SHA-256 e258db82006e4d1b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 15:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b369bc1e9f82957ba574f824936b43ca SHA-1: faa1fec845a456d076b5d2e7f864deffd5e420e4 SHA-256: e258db82006e4d1b79e4d3d393e2b56657cece2b168d5583b3c786af18f3dfe1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm behavior is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/32c0de9c76a1e0c1d585029469fbd1aa/22325390258.pdf In PDF document text
    • http://studiotrusso.it/userfiles/files/89659621278.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/kenoxuvoxibozudowibona.pdfIn PDF document text
    • http://getvisa.ru/images/File/sosilijawopu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9a5b5fcf---18291011655.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a64f16a8e---29941065688.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075346c9c292---notujikekajixafu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210810/1641341799.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/76826583489.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/95143105327.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/459o3gost44ct4658dhobkn0d2/gipijixeburaborolo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/pavumaxefezovagivoxove.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/82734254003.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/918232c335ccb3c69e21ed4f14ac44b5/30416387373.pdfIn PDF document text
    • http://foodchemsino.com/d/files/16887303002.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/bijirudusubawo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1daeb587---39560219534.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202184750278566.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbddfdc1b7---gedafonejiji.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/81479329096.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/vuvagevojobebofokodumop.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/83682653535.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/diwipoloretifofibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+to+write+in+a+baby+book+as+a+cardPDF 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_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 17640 bytes
SHA-256: 6becb702e67457df85cdf0a9673b70a12167304e45864cd05e97ad48e60bcf99
font_01_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EF 10848 bytes
SHA-256: 298ff35f9578a5bc09ad58d9885fd85073a0f762375d3bca18b2db69bae51839

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