Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f49fa0ef96f469f…

MALICIOUS

PDF

113.7 KB Created: 2021-09-07 08:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c407fa1752bebe0b1ad336af757b3af SHA-1: 74d39d04afd7e1911f7e02fb5936cb2ae365c8e1 SHA-256: 3f49fa0ef96f469fb0a80906ec9d27a812ddef8bb8b6ff60375a70810a28f129
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kodcomputers.ro/2664/uploads/29776485338.pdf In PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/38730257486.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/51553322329.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f81ff41a0---kifusetikukif.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b0aca5fe25---55432748929.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/53c78235fa6df9f58a339c6764f5813d/32868705439.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/92385203343.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05ed5830a2---denusazuxanojopej.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dulokidozolamofosupulimir.pdfIn PDF document text
    • http://abnicum.com/files/file/79638123540.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93b22dcce---butorani.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/49184567390.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/56958964180.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/rifawupo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8150bc3c6---teligop.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/60323812924.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab8420efe---38009005628.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210718163535_1mp9f7.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hip371ia4ah4dis7g7ndv6pmk9/zisewe.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/69309919615.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4a245c966---49642163788.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/vomewote.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/65302737715.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/86382989279f88a528fbc1ed82259ee6/zigagadariso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+snowball+sampling+method+pdfPDF 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_off00015580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15580 19212 bytes
SHA-256: 8d07a0e071869ab75a1a782edb899c88936d1de4b43bf3160639b32af090b5e9
font_01_sfnt_off0001873e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873E 11156 bytes
SHA-256: f45d2253de26b71e5f857399b4b0c58e88ca037d7047f04e70b614f56e048973
font_02_sfnt_off0001a0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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