Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a86b686e04811e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 07:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ce2d64773e7a27086e3cfdea216438f SHA-1: 38fd0ca0d800473f5e5d1921eb606e6f69477528 SHA-256: 76a86b686e04811e537f24937234e02770d67e48d257c028c2a153d1fd6f551c
176 Risk Score

Malware Insights

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

The file was detected as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to domains associated with link farms or potentially compromised CMS uploads. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into visiting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bruceautoservice.com/files/file/rulisobumurabujatobo.pdf In PDF document text
    • https://gyn-koe70.de/obrazky/file/sivogewu.pdfIn PDF document text
    • https://appfacile.it/file/belevokezusukefazidiwepex.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/285438006.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/96224965846.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/21816311287.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/30423084026.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/57897091279.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef83542b22c2f0fffce7b1d586d0762d/92554218853.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da13fc65fc---56648027066.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/pimedizetafosufo.pdfIn PDF document text
    • http://rurisnet.org/images/file/36761056181.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/898f94cfa7ed99238b6f2870a26a1d3c/joxivemoxojolibidigul.pdfIn PDF document text
    • https://parc-hotel.info/file/jajefede.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/samohcivt5dtrqk22f13ai28vh/nizonax.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rirexegipaburazoj.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/19543520187.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/21g5ladi96qb7964qqjpac8v87/85043092229.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/54083129212.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/melemekalimugixapitek.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/kiweririsodixazeju.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/01234189c2833090793b8d6018b3c8fb/tidijitafik.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b78d98bdb---29571721142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+confederacy+of+dunces+by+john+kennedy+toole+pdfPDF 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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 11180 bytes
SHA-256: 5b5e7ac458104abde57fb8a020cf94f5a15102316a595f2432877e36d8fae277
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 17440 bytes
SHA-256: bba99b3c1b4b82480fd11a99d15a645109e683fb7b04c6ce168e80258f588639

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