Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2df500d86c0f11…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 13:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a88db85c698178e362bc5b189ba8eb4 SHA-1: c2b3679e40cae18a3a15754c3a1fbafa01bfa376 SHA-256: cf2df500d86c0f1147a23716b6845b06c352e6d02b1dcb5abab9cfbc47867253
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document's primary purpose is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.alexgis.com/siteuploads/editorimg/file/kabewetekuduxosubinof.pdf In PDF document text
    • https://livbiopharma.com/userfiles/file/71956976360.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161444ed67e608---87376364496.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/20785280041.pdfIn PDF document text
    • https://aokman-drive.com/d/files/togefopanigoxujedepabuxe.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/97394662993.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/75902572741.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d55ad5c8299d1d697ce86285a571c014/79917083294.pdfIn PDF document text
    • http://rococosofa.com/files/files/rawafuvepufuj.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/91068004103.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4d22a27b---wilonimekuvelap.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/tilolivixezeru.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/xugemikowijipuda.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/babenaxufoge.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/fudademujebupafuzeziso.pdfIn PDF document text
    • https://olterus.info/contents/files/65303938294.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kamixiduro.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/potowivurejoxeramod.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/bosefubevudiwovugutipo.pdfIn PDF document text
    • https://suruburi.net/mm/file/22749999891.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/84561847587.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/46009494528.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/30011366785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=safari+zone+soulsilverPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 17228 bytes
SHA-256: abfc5edb02eae9fc54771ade622b9a4236a644e56fa95be4faaf8e9a63abd3f0
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 10408 bytes
SHA-256: f194bf6e71b539cdbb1d45acd0a52c3521b3076f306bfb50149282762ab0f05d