Malicious PDF — malware analysis report

Static analysis result for SHA-256 700b22ff26641eb9…

MALICIOUS

PDF

97.5 KB Created: 2021-07-07 08:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 648159101c282a90f924f5d875de157b SHA-1: 607a2b23ee29a4b104b245f6b43341b40ec04a2f SHA-256: 700b22ff26641eb9d39b51a7dc51ab93376f63ec5e2b757419c4df2c5abfaa68
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm pointing to various PDF files hosted on potentially compromised websites, and also exhibits callback phishing characteristics by luring users to call a phone number. While no scripts were directly extracted, the nature of the embedded URLs and the phishing lure suggest an attempt to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=stranger+things+suzy PDF link annotation
    • https://trvstore.com/userfiles/file/zevakogu.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/lejadovenesedibiwal.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527020724.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/43162609607.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/94193222156.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/guravemar.pdfIn PDF document text
    • http://cwesp.biz/upload/file/87465577050.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d13103f312---68603836665.pdfIn PDF document text
    • http://waterreducer.cn/d/files/welakaxo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qfum7330mc9mliqvb6ldmvip30/kakuzugigulomela.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dazedubixuxerejagezipoguk.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f0434603---bajivujugoderasusuwa.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93b613cec---mivinenaxikorotegofusawes.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/24610321406.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4316d17352---6884975062.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609681e087d9d---84919110476.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/nujetutekiza.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e39796c85---bilisiluretubixituzamo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dc1b3ed4e085ba12b368deec73907a65/6261767141.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/25052252592.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d4ee6eb1---36241903927.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 18224 bytes
SHA-256: 557d48d9aa2001b0cdb01605372dcba7adef302e0586654524bdc06f32fdcb42
font_01_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 16220 bytes
SHA-256: 0491461efea0d38e00d742997c562b9409ed1dc9639e8611f706cfa0f0983ac9
font_03_sfnt_off0001604e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604E 10568 bytes
SHA-256: 41dd206996f6b4766f8e773b7cbfc03f6522455e7b67e7ceef2154b4e5984973

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