Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bec0f978435f45…

MALICIOUS

PDF

78.6 KB Created: 2021-08-29 08:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac0ca82d99bf5f188e44be258d3afc27 SHA-1: e8696325bba8a2b8a2e2e33af6ae897030debb8a SHA-256: 39bec0f978435f453631ac85bdec69a1856180c71ac906f39d048e3777d754e9
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and numerous external links are consistent with a malicious document used as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096852777029---vutobifore.pdf In PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/kixatuzudavinopewexuza.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/88032489474.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/34266770568.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/muxabelibalusalevitid.pdfIn PDF document text
    • https://haidangpc.com/contents/files/88856093962.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/fobinonowigutusavewi.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/79234906508.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/xozesus.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/20694d6eb4835daad5d5559924991648/60574756868.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/14970120339.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/81735b904418139681151a0b6816d1a4/25667552845.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/39674458968.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0990685d49---67902153391.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/21138988623.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/bimibegetubunedav.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/vedopudiguz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed945c397---92873666223.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/866cd599f455d631d8e5d6183911bdac/mogagegamilixusix.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/18226009037.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5d486e719b7e2992741521d25a44293d/xajibam.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/wirisejowevafid.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6801f5ffed8b8d3218deb6dfcc16aafb/43364086735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cackle+of+hyenasPDF 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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 18280 bytes
SHA-256: b62526f8d34a8fbe3bb9084a2153c0131a158ee15afff8043d32ab587289817b
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 10380 bytes
SHA-256: ed99de7a335b0f3893beac1ceb877fcc6eb1b3d6ec39a6a1a8f403863bcb5187
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1