Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ae24ed1d4494f7…

MALICIOUS

PDF

72.7 KB Created: 2021-05-10 07:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f285103fd58bc09b6bb64bfaab981096 SHA-1: 9631336a8757da36280e38f4fb7f5b69d08a6b0a SHA-256: 43ae24ed1d4494f7b9a74c37c14b3d8d546d27451dd43c80e82625d02ce3e012
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The document body, though heavily obfuscated, contains references to 'Aetna provider complaint and appeal form' and 'wkhtmltopdf', which could be used as a lure to trick users into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e0b27803f428ddb277d34f237686d2f4/1164257743.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/52qngkvepak8o5esiq3nr9i90f/mofoxe.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864b8220746---19605495471.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f881ed8b---40377427914.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3b7aef21ce13dc501c8c2f1c2438be83/vigubogiwijogo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/83864270399.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6721f672fb63749b1971b89736c1b876/76691617631.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778b28f9d---kinojosodopowavim.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160807cc9474c9---92457686784.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/878oic01hchdt4bsnjucppcftj/50313154084.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4653b7a01---bizafanurefebu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/84df9a76e3a02bb3f58f7d5a4ac876b0/lotejowuwewewaf.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lonegujurovate.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/10712233039.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ed2323ed84493b00474a28b9f5724dc0/tanofixorab.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757e39ab72c---jufiguxaxit.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82113553631.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/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=aetna+provider+complaint+and+appeal+formPDF 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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 4960 bytes
SHA-256: 7825d87946a3b145f6b18fb65db1ebbb431961c3c037cda1f669dc7eee637ec8
font_01_sfnt_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 10736 bytes
SHA-256: ba0fd1dca492e4f000a321b6d6fd6531e86e7ee36d4651b4e0bbb186ebed66cb
font_02_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.