Malicious PDF — malware analysis report

Static analysis result for SHA-256 f148d5413dc2ee96…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 11:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab8b38eb5bd673fe0d9c8c8d9175ef2f SHA-1: 65aafa55e1cd750481758aaeadb289a3d869dc11 SHA-256: f148d5413dc2ee963dfded7bc18660b57ff3c98e520d3a127087b0472e2dbe3e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to host further malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's primary purpose is to distribute links to potentially malicious or compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sjmvvffkg461qj9gjmk8p1fmp1/zemutofomuji.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a729fe67---13292687025.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080031bc90fe---11505503067.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hck5rj1h7jr0sj8doclja3ivt7/80680932386.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d742c9a0c18a2bbb08cb911c2e145cd2/fomuxipigivu.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wumawatasadusugirowazosid.pdfIn PDF document text
    • http://fpole.ru/sadm_files/fiwikivani.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a899aa6f585---pujazafedobikirojowogezep.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77694462982.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/58208210026.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070c896d4c8f---45656055895.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5195905e---31101790581.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/relere.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kexaral.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/3caeln2c0dfe8g125m931959mf/87304575636.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/vodulumewibesegimoxilabur.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/muwimimi.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/674894d1e5c7911ebe779f8e82bcd409/zodozad.pdfIn PDF document text
    • https://windsbs.biz/files/file/derateta.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/5168175317.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9bqeqk633rko20jrcpfq6uq891/palalazisomevugalu.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/56994735181.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1bc21b0a3092e3774a6b7a04f26fd8bf/vojunizumoxafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=humboldt+5001+nuclear+density+gauge+manualPDF 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_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 18632 bytes
SHA-256: 2abc1923695fa6cf7c660f75a8d08c6035b671d0edd8c38d17290b4122b9dd9b
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 11368 bytes
SHA-256: cef64f203e0115be0f0edb7cee55c999cb056d11899b8aa2cf6aa2a36f8a6cfc