Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1ede70a8ad72d8…

MALICIOUS

PDF

146.8 KB Created: 2021-10-09 15:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9fb4fb7fa29317eb538f3659865f5e44 SHA-1: ff704cd328e577da0935fd9927accefc0b739c8a SHA-256: fc1ede70a8ad72d8b4123e755abdd80de045fd0119f0c2b529facbe1c45bf30d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites, often using UTM parameters for tracking. These tactics suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://philabc.ru/uplcv?utm_term=sword+apartments+cookeville+tn PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1kd25rv442uabvn78nbtbldp2/puzofojofijipuzafuges.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/valofitaroleli.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/bebibimubenagigewupipot.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/legezina.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210903210528_2038738389.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/51710451780.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/42860716468.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/tagav.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091403575824.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/73824991370.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4ea095f5---bofumepobexegulazulozi.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lerozugota.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/sifemaxopisa.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/nitiritomebaz.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021100920260021.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/tenimu.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/26698791898.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/17888506382.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gezupavaboluvifud.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/kipisinaketefolop.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef89dfdb8---67170469626.pdfIn PDF document text
    • https://il-gusto.com/images/file/83271933919.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D25D 21848 bytes
SHA-256: 3297e1ee5b369a2aee5f1c37daa63d50e78488a636ea3349c7a28493286f39ea
font_01_sfnt_off000209f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209F6 10992 bytes
SHA-256: 8b53103dbacde358b25607e5ae80f35d82499f73812e2fc2867b244948e797b5
font_02_sfnt_off00022388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1