Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8d5e4d3d013ba2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-12 23:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0153e9ad4a50725671fd500539e820a5 SHA-1: cb16a4ef3de054cec1816facbd4d4ccf2c873f99 SHA-256: 1c8d5e4d3d013ba29e40512121218d3d54d48c108771151f0b37aba22b99d886
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common techniques for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://currycornersugarland.com/admin/images/file/zagemixixaxujexosu.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613665e913d47---70803657844.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/ziwivalarutigil.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lurefumejivanirabojovapu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/88534121027.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/15111458605.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xomevejagiloverizo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/60969196074.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/35717985398.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100853569440.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/59041458583.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/42874981099.pdfIn PDF document text
    • http://ausafe.net/images/art/files/kujeposigijerexogitapu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fbec66121---85997558809.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6c1cb7c6---rizudibixuxo.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/milosiletixen.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/38192471208.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/26177478855.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/87848685356.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/87324607662.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cd5063cab1871f3dc960caf217b33be9/lufazolotoleladutuwop.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/kikefomerefirafexaralewol.pdfIn PDF document text
    • http://popmetre.com/news/files/loxeperirafox.pdfIn PDF document text
    • https://izometal.net/mm/file/kejapirezakuxaniwor.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/reponosenisufatusoji.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/madakudovoxefufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=movie+hd+2freePDF 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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 10052 bytes
SHA-256: 72817b7a07c34e5d6889a0fcd1a0d1ebd497abf955152941521962cbeaeab21e
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 15324 bytes
SHA-256: 7d8539994aa2aeb3eaec421019da5a05d1ab383ed4a4e6c9d025c16d8082b785
font_02_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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