Malicious PDF — malware analysis report

Static analysis result for SHA-256 2877ec573e1ab9b3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a16fa52e151befdd17be93534137632 SHA-1: c636dfc544cf18eda3c3f3909775b000d6b8f456 SHA-256: 2877ec573e1ab9b3e500ec6b44e20ac36b6261b9e58f9796d41dc5b5b4538aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves leveraging these links to potentially deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://hilimall.ae/uploads/files/31712757160.pdf In PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/zijixaxudaxorug.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/6241643471.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607341013b14d---puzovepibugaradiz.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/68521030801.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tatezivikumidopawurivozi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/d673ks8i4s2s2e8ji3uagg1lj1/kiguvemejajofebadomolo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/baf1d397c67e68b7703d1b1b69b90aa5/17706147328.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/24408586972.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/61977d65be157f1e784a36409c71d72f/20004610075.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/duwudabip.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/61209235274.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/65724110272.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/91315195651.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f9j5shee7k4bcnitstsp8msvq9/tepadimi.pdfIn PDF document text
    • https://rintrans.com/files/baminanopujuxiwozuwiw.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/78013548496.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/34192413339.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7fd7cfa2379c19b4e2837491408935f8/wotoxorazigigu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/15142ce3a90fdcebe78dcd0c444283b3/3291962161.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/13102591803.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cfc744411---12664405422.pdfIn PDF document text
    • https://penal-garazh.ru/files/sulujikosoxetave.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/jixoloxoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=world+best+seller+books+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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 17048 bytes
SHA-256: eac81db39ef0833ae7777d57d4a3ae16994f46d749e5b7271a01fb5fcf564e7d
font_02_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 10360 bytes
SHA-256: 1099633cda2e183e510d86ab79a9d634ce5d145598212ae59f30a4d824dd2919

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