Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ced8c60ecb0725c…

MALICIOUS

PDF

77.4 KB Created: 2021-07-03 23:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b11e3ac901ed8fb4d7c2af186216292 SHA-1: 1430bc5c10bf403b3cceb0e19b98a26c928d700b SHA-256: 8ced8c60ecb0725cf5316903ef088e9dfed9481879d6ae1b134deef6bdc63b28
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be social engineering through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27479f31be616055141b499a257b98b2/zododuxalepinorat.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b070b95a---7866739882.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a41n8emu4l4t51ulr37o2jusbp/59898646127.pdf
    • http://podlahypilat.cz/admin/file/59735806307.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1r6i153pb4eia9rnjjvb2vbfbn/vegejivuna.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bfee9f1e---denidufemuxip.pdf
    • https://egyiksem.hu/uploads/file/xigexazirimuwejexelopi.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d055b51d59---pigafopo.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddab031f73c---vivoluvid.pdf
    • http://tpokebar.com/uploads/files/rukamegozafone.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/57459993311.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/48464794833.pdf
    • http://architettoseneca.com/userfiles/files/37804943566.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892aa804b38---soradebosewowe.pdf
    • https://communeouchamps.fr/userfiles/file/fuzixevokured.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe0491f08---52999916438.pdf
    • https://www.carrentchiengmai.com/files/zotexifupakabugolu.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dc4a53a130cbdc1f2fc04c3d4ed0c20b/69500596986.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607864bbc235b---368189112.pdf
    • http://ddaengshop.com/ckupload/files/42455482470.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o3ab4dd3rvtf6nrunu3p6d1ra2/bixogajabedi.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d81eac3b5c09b39beec66c09f05aa25b/zebogekubonu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6e624f0e---15983844200.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=songs+about+pink
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef6.bin
8ae43af609cd2b83b11fea386c1c33eb89c9f4d2a1b66e05493d570b6c497180
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 10556 bytes
font_01_sfnt_off0000e6fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 16792 bytes
font_02_sfnt_off0000ff0d.bin
b7443cb5a5be9929253f378dfd4119351aa14fb9d666229165e28eb3aeae919b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16464 bytes