Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6c74f4b9525d71…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 02:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e25e5be65acd301743adad94f6f1cbf SHA-1: 60511365960428f0579d23263f1a5a9a5b1d5ccc SHA-256: ba6c74f4b9525d715f8980efdd4dade80a429bd7680fde5a4c9977c9222bdba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to potentially compromised WordPress upload directories. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or phishing sites. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/i4sorrnp5ufe5en9lmd43mtbad/6787254323.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4plk9ivg6dfeso5mh28vpbfme5/53044828501.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d9cc54107e819f7e22fd8af89c49c78a/91730107203.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/liridogaginelemuvidoles.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/57416939243.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/betorunimukenadawepavitof.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/42311822504.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/pogezi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/49120e0807050358cd3bd42842262cfc/bizanerikuvomeninofenino.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/54340135905.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/055b166daf8d9b63eb7a71f77d4c7ae9/jurijaruxileviveti.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/nepodiwifa.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6d76bb1f67f8648a4e03e5890a9bb445/94202597737.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/laxoguwexegofenivor.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/98378635132.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/guxasejif.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/3399576645.pdfIn PDF document text
    • https://faprosid.com/file/kogekabifebufukususa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f668ae3d127663d877fcb15b4f80d6e4/panatudenazexub.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/56e53f7c2fd4e81cd1fb94a7808ee003/jumap.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/77336427727.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ubr0rk1im3sg25iplf3dt77rvj/90425700164.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/nevegamisirukubexor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=words+for+funnyPDF 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_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 17972 bytes
SHA-256: a324d6bc35be1d68411239d87f95f702273fc6238de183f39742b2e388281c90
font_01_sfnt_off00014615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 10024 bytes
SHA-256: b99116b64a9b23b6470fb646288196e2f9ee7212228b45717c53d639302d8fbc
font_02_sfnt_off00015c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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