Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a13502bdf950f4c…

MALICIOUS

PDF

133.4 KB Created: 2021-07-13 23:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c6fa2621d88a464617e0f5da64c2a19e SHA-1: ffebf5efd2d23b1e9ec12d6aa9ffd5a9b2924960 SHA-256: 4a13502bdf950f4c56d90b83eebc6d1efdb095b661651b90899f3fa6ffa9ce5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=the+avengers+sequence PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/j6lddlghkj9nq5sfv8bp04htj2/jubovame.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/rafutusadatisuvopeje.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/jerowa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e52305760---larurugasup.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ff248da3---kigawaka.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ffdc25f2386caa8e1089b9958d5622b9/kafubamamixu.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/73415675620.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0c960e0a48c537564ecedf538c0e4670/duwibovilepabowabowu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/089dd67b35de5ab8695bf90e7f572f3c/wikomoxowumipuwekodese.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7fd7cfa2379c19b4e2837491408935f8/wotoxorazigigu.pdfIn PDF document text
    • http://parentini.it/userfiles/files/46932731615.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ab460e3c2a5925edb4d9c9117cb91f56/79077771343.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/319714352.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/ritanefutozikupununobez.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21c208d74---21143767591.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cc9b8b6734611597d656afd450756bf4/68493938788.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ff3d9cdaf---bikoxetixi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862183eb784---28734282909.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a5405ee21d1754abcc82c29ad0b2b4c9/96010417639.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0b9b5a12---jovibesubupejebezoganar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a8299b423---bobamozakelofaro.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/aaa2861c797e19a9d4baf88b88bf08e4/velakomemorinoreda.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ef2b8cc0801adea3d13b4c7d5ba44d40/xijugibarugazibotoxap.pdfIn PDF document text
    • https://4appsoftware.it/file/konezora.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_off0001a914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C126 18076 bytes
SHA-256: e67a5f897857e2219a85e3eaf02a4ce9786f72f6dae19735d7f29a4d02a9fb2c
font_02_sfnt_off0001f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0D0 10428 bytes
SHA-256: 277535a462c063694ebeeee5ed4f196562645a597a45d3d5d95c37aac6526f70

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