Malicious PDF — malware analysis report

Static analysis result for SHA-256 2546ae5e66444950…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 22:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f5465e050dc9c46932759b9800bc152f SHA-1: 6080296dcf7e7e09df0eb8bcbacdc44e7add057f SHA-256: 2546ae5e66444950375632e36e6eed165735688808d8f4cecffa7b348311f1e5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skvacations.com/userfiles/file/kevegogonokugubikiza.pdf In PDF document text
    • https://t2sc.me/userfiles/dularu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/3312784262.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160718df24091a---514784717.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/91f479091e2c501417da981289e38d04/gaminavo.pdfIn PDF document text
    • https://amblamy.ee/upload/file/76429938650.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/95c8734f8359e10b2d3fd14e9eebdd96/98700783115.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/bafururumaku.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/rekarutofogif.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/19059909080.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/vowejutafilojomimumo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a4phpn1po8usg2fuiia0eeit37/43180158622.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/60648694003.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e7ac29527fe3c35e7d5a77426707be6f/26253753610.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f40f05d9489f18db6d1574e51a7df3d1/jokivokineweva.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d32baf2934056f81f79d966f0195abb4/63473033024.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7574d76b6c707db8315600bea82925e2/vosesoxasefopexajesobegis.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/fitapuv.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/zuleselobaluzalosodin.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3ab29a8448e936b66db66ab37b150bad/61573358137.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0978d03a8---tekulu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/23741684723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sleep+as+android+iphonePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10468 bytes
SHA-256: 69475b6940f6c4d50054733b153fc121c4690722131ca5ef338982f96f728397
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 17032 bytes
SHA-256: 05f9b7df8944dca7eaaa05939f3adb19965453ce3ec83a60f0601e5d513da85b

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