Malicious PDF — malware analysis report

Static analysis result for SHA-256 461add38bfb07df3…

MALICIOUS

PDF

84.0 KB Created: 2021-07-20 20:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28a81469763755d7e523c95d8452e27f SHA-1: 45b6640f9b9c547d31f2e2716a19a93fda1d1747 SHA-256: 461add38bfb07df3994ac50ed6989df1bb2c70f83ec23d99807faf8d28e83763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, while some are confirmed benign, point to a pattern of hosting malicious content on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e7347cdf1---suzakojisejo.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d14b67bf---75748151179.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ace46119---47869775628.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/487b41b809a3df08aed02769a965cee0/43913877851.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zusazizodizafosij.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/72429012270.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/10760304105.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/498b85b3283ef81acb2f5fd27276bc0f/kezozovevazon.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5412a814f9f5b412ad3d9a15d4c23e9d/48515516632.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/makalizujikitarafesobem.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f1415ba828f---95372025594.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/47605008010.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/86944272290.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ce8d8b7eee---57878794003.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/bewujibosopukulonobiru.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/42072820991.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s68rhke2futrk3r85fun5f1jnr/91012753572.pdfIn PDF document text
    • http://imaginove.eu/data/Files/memizuvifeno.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ca900cff880ca7913904c394f69792a1/46521674340.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/46884405670.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a063a470a---mitidixijejuxekopevow.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a4efd0b---finameluzapudufiwilenegop.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/9607768502.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e42700e3ed8---59878432831.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/1980521232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cool+black+backgrounds+for+iphonePDF 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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 11164 bytes
SHA-256: 70ef85ff8b6c93c2c07fa079d4b338e35544d3e958c7e940b4ce15b5a0d85f74
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17580 bytes
SHA-256: 445199b79fa144ee5b526bfb167474cef96fcd0e6ebad2d2ec14765cb397111f
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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