Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0198c7a6666e0dd…

MALICIOUS

PDF

76.5 KB Created: 2021-08-14 06:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4890a5c008b40211194fa60e3496eb5d SHA-1: 9f7a2a50ad93fb329d9706ad8db017f5cd7e2ed9 SHA-256: f0198c7a6666e0dd53fc09783c73b5b9266dd482a3e89cd1074cf8954a73def7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://carszana.com/image/upload/File/mopufo.pdf In PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/95643909056.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/pivegosafabajimopox.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/4431882595.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/20343144149.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/rusijelaj.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106251955.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fenqdg9hsgn990v173rq0rh3ec/raxigobona.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/19487656222.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/df508ea7970ef2b07c968e02618c6175/35970256338.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/750cc8e9bfa1705311dd207b2da3d598/getifojuwunenisipe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607259de44e19---kolojaramuvevuzid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160824793c2a2e---40045624278.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c6adbaadc45---31413324915.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/06ac745a86348085d711acd50addd412/zasuwefival.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90e2ab663---nuxazalukizezotuputof.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/dewotogomibizozolo.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/dadumoguluzelab.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/69526545729.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/86897879217.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925221a7aa0---mebufokode.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/97012295430.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/9705378137.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/13987065975.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/30188462284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=holt+mcdougal+literature+interactive+reader+grade+10+answer+key+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_off0000bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5A 11584 bytes
SHA-256: 56e5431f30197cbae11e72b83a1a28d5a0773ce64bb7f8da1c939674a4691aea
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 18412 bytes
SHA-256: 3e8104abd9dc41088404218545c61a80d5ada94da06f277448f533edbb6c8c46
font_02_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1