Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d1429f467934b8…

MALICIOUS

PDF

83.3 KB Created: 2021-07-29 15:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 453d11adde86801079f6448ab30871c9 SHA-1: 229e953e24ad3d73f0bb86f494325e329ffe39ff SHA-256: c0d1429f467934b8776b43de2cebdf293d88b4f2ffc0ddce5775d7150f6ccbd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.aluvascientific.com/UserFiles/file/gojofodirelulitov.pdf In PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66c0c03bc---7183147743.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/5891814346.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/26793165702.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d66815bd8---zuwirozip.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tps6s6f58i4530eob8g4jbm137/66238647788.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f17b67e1d---71177423970.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nemipo.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/tinalumar.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/8822903678.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65c22f263a871fab6db0b2bf3b026f8e/60191408016.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e82b3586843fdde198e6682cde7ea9c6/kowuruw.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/aek4jf7kqdb9vhvcb7hklgril7/31384359367.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6f514bb6---rilarijegoruliremifev.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/49859019873.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ab3c67c8cb9c50e91adba87c6f9c4940/fukusitadeziparixodata.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/4457971685.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/46340042612.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab784b3ea3a---5689844791.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/nalosogif.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/duxepatasulatesanap.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/subitisowuborujixun.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/55942682130.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/6271524789.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/11160646563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=engcon+tiltrotator+nzPDF 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 10148 bytes
SHA-256: aa5ab7be0eeecb41f1c2bb95bfdcba4869218e332fd42892ed50696bc3017229
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 18260 bytes
SHA-256: 54424482aa48d30d901c4491a1f47fea22bf7a6cbd6d4c5f379b93a112c47b24
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1