Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf114ad00a9a47e1…

MALICIOUS

PDF

94.3 KB Created: 2021-09-25 06:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58ee2a793528b3250be0851fed5e0589 SHA-1: 89fce57582d701bc4f99399ab0866b1c5c21a335 SHA-256: cf114ad00a9a47e18f474cb7982c6ac2127ce50eceb851f244eaf7eb162873d0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute links across various low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://chcial.ru/uplcv?utm_term=dobry+program+do+obr%C3%B3bki+zdj%C4%99%C4%87+android PDF link annotation
    • https://juvelyrikoscentras.lt/Files/file/43927179286.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pupabugonagikabarukagesex.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/r3s0ppthb6h9jd3n5nhcvsq782/sebavo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/nopodeje.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/81744673506.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/56922228171.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/tumulijabemejivuna.pdfIn PDF document text
    • https://serka.com/serka/upload/files/63295464385.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4d57ef2a---nuzowug.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/80905272140.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/csk54ueacgtnkiha4knior9o87/jexilakagisoxipesetabow.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/76975355004.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/21055171309.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/47000873126.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/37402741624.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904143309.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/48506106854.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/48809681407.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/lapugodapimuxavidofajozuf.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/wusipekobow.pdfIn PDF document text
    • https://inks.bg/userfiles/file/9208193310.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eaff06b7---94534291157.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/badiwarirofubesekudapitut.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/57704395406.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/97776627954.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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 18512 bytes
SHA-256: b2fb771ef94accdcceb563ddf0803b2cf2a42400d7d3c8eb6b49ddf8141a1edb
font_02_sfnt_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00014efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFC 11312 bytes
SHA-256: 1a62c53ccd2b49d6536788db9919f326d3e1db1fcdd51e3aa5199f1300adfeeb

Open this report in the interactive analyzer, or submit your own file for analysis.