Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11214b8bed8d4dd…

MALICIOUS

PDF

96.3 KB Created: 2021-05-28 19:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 81af7ae9893054a78a433f26df73b1e2 SHA-1: 48efad1bc29da18d9034cbeca85c9813482be1b4 SHA-256: d11214b8bed8d4dd6df1f17fb71ca338d5278047462baaec715fef94655fd39d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, disguised as a guide for reading washer error codes. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content hosted on these compromised domains.

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9bd84e909bb60994eafbcd866aeaa199/8046770286.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/58ef81c3d296c87eb810faf65b938f48/puwalirajob.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/tejevadopafija.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210507151451.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c2dfc141bd040271d3aa6d495fd771ce/gokuriropovufumurazipe.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/523b0c01ed6492bbb902903eb13159b6/53871728264.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/fivarobafaxefofepigefelu.pdfIn PDF document text
    • http://ubest.ru/images/file/41323016546.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/18ad8170e71e3d234a51b8a7526a06fb/tatez.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jismu717kle2ni1nnsksmgs0pp/21055674571.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/52295316755.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb81357db5---54220290558.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16094d2067c311---70787303702.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/86b9f5079e60e4d4601fd6636d4b0e82/pozuv.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2116ae1b8f---mutor.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/51395055613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+read+whirlpool+top+load+washer+error+codesPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 5212 bytes
SHA-256: a80a3cfdcb26c82f713c5267eea3eb0f6ca52e69c2216bc516a5d78376c92cf7
font_01_sfnt_off00014e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E13 11128 bytes
SHA-256: f856f04f2f2040e47179c183ecc0b2d836f0b6ae3fcb77f1353e0e2a5af2e9f9