Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9898103b55163a8…

MALICIOUS

PDF

71.8 KB Created: 2021-06-19 02:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000db30245e965e79aac0b6901c11d3e SHA-1: 4f33b163a91077521190b764e84f5ae24428ee5b SHA-256: d9898103b55163a823fcdf6ecbeb61c3f0ae06941f5b4dbcf87ed7b68a249e38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is part of a phishing campaign. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised domains indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d078c7aefe---zebapusaferapasufujusa.pdf
    • https://retta-bg.com/userfiles/famipuritira.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d7ec2f6fe817e667ba7daa91b9b3a5c7/gesibebifogibinemupa.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c964021ca1---zazixuba.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c634d45b66---lulavizufol.pdf
    • http://lorichphoto.com/pictures/file/gepumatimilojulibowabisa.pdf
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/limanojitetawuwep.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cira82molh4p1ia5q54knki271/buvakulirezatet.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9e2d608---38728705403.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9b0cd7cec34419bcf9d88ff1ba73fb78/89729276268.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26d242a14---87701103304.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23e0c2096---zeluvapifux.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7051d29f4d---45723496844.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98c043927---xanejetetuguzaminadafave.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f741eee8a5---xevisupe.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3f564154---51627358993.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/snua6umluplj3c94iuggieh45u/32059974812.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=paper+chatterbox+template
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca0.bin
d5553343344ef0cfe07600dd1c230dc40db409e7442a534c6ad88b3d6754a3bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 5204 bytes
font_01_sfnt_off0000ee2a.bin
2f551debe7699a256257e68777f240b7f4143c6a40ab6118a76f9ea9e5de602c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10592 bytes