Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcc5bc06d0bebeb…

MALICIOUS

PDF

69.0 KB Created: 2021-04-28 11:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8ea66e9eb5caa3b443d609760e78bfca SHA-1: 3c983252a140246769fb5112ad7882f7122ffa77 SHA-256: 9fcc5bc06d0bebebef3124f505c4b56a3109f3ef4cde3284b5663bf8b5a38021
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086465b4f1df---38779337916.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/79ae947ebabb43575dac88eba89401b6/jakos.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075eeefe2e49---45441558072.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/65c9350fa27fbe5789bb2c7c9afea1ce/zidaketumoledimepovu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/an8rgmqf8ecie7lbvr82caa8mv/35230662151.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a049acc003db9de0f5b5aac746f6542d/sisupapamuzamupojut.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073200db4ad3---46731529920.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/91cg5okmjmgqb7dt9417hutd77/2579583627.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2622e5c3---52420891311.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738775bc218---33332312516.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160854912217f7---poretudasebuwu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b57a87696f60320c03b0085bc52c5cd3/75253977110.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f13953ca---44977316754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=q+es+uniforme+en+fisicaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 4860 bytes
SHA-256: 9d3ca95bb5f8ca96deeee4a694fd4c8679f20548fdf754f1d532a1cd24e6e73c
font_01_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10536 bytes
SHA-256: d55c18a2977e53c7beec7ec4a0758c19d046c7362d6a636626ceac28d5af418a
font_02_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2