Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cb62e525c317b2…

MALICIOUS

PDF

92.7 KB Created: 2021-09-16 03:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32b4692de84d40766b2d059cf0179248 SHA-1: 3116b2655b16f3e5445b848f238e8f04f3fd09a0 SHA-256: b2cb62e525c317b2df1dbc60019020984e01ac7314dacc374b514c64b163c4e1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing attempt, likely using embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=show+message+box+in+android PDF link annotation
    • http://tikatalog.sk/_files/file/89457975457.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/puwefufopukalowe.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/86838017415.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161333676a9e0e---kufow.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/tepemelenino.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xemutolajatu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d0a9b6f8---76557258407.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/50477654345.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/zetomoburujemozis.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/mebesijekenodaluboro.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24fa99b5a---mebatapibuk.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/4085007361.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d6e9d2c7---29526172524.pdfIn PDF document text
    • http://punaide.com/userfiles/files/47398577690.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109071237185419.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/zoledezagodiwin.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/vewodinomasukebitosarobu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d79b81a26---kifitenufifujagawikusa.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/xilejikagezuleberoweju.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/makidolaborerebaw.pdfIn PDF document text
    • http://yongqingtech.com/d/files/fipomavig.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/84603326526.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613ad89e1c---naxoxulexeludexage.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305350464d6---bibizire.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ua9q95bi6hvammirdq1hqr5hf8/vakedemuzifowovujikejevow.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kipafizezemaje.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_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10952 bytes
SHA-256: e9a2c11f0221f86560934893908d36f7270e2aab1ae20005ebf6271d5bafc4f7
font_01_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 17872 bytes
SHA-256: 62785c0d83586b19d7c60880c070f6dfbf76090fe37ebe3c44993743742c8eb3
font_02_sfnt_off00014ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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