Malicious PDF — malware analysis report

Static analysis result for SHA-256 f734f3fb5c0ffca2…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 16:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 924f9a28dec6ff3ee0c5c4f0056f118c SHA-1: 3985d3ac2bcee8e9f73a870acfb60bb33a2a0f14 SHA-256: f734f3fb5c0ffca2969c1a4d20f76cf23264ecc1f9718f91a7448bcdfa835ce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://thetuckerfamilyreunion.com/clients/67950/File/53768999937.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd71e9585---dotureromaxu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b340a561a---52351501031.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segag.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/ririsigimu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160904946147e2---sefafuvowunaro.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/90375904801.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e90018f63---85975828099.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/80714760433.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/34384558249.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/dutiwenitomenos.pdfIn PDF document text
    • https://samowar.me/userfiles/files/sedekeji.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9aaab25f0f---goneviwasejelufesup.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/lumuwakasulugafud.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/65e446f9036756f5d3cf716faa354d02/xusisigizup.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/noxeratukegigakomelajewir.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580a6dcf7c---698736885.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/piduno.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/seacv5os9u9gs1ge2l46n44m15/badibuxebibotebopobo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/46191196755.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/fiwomuf.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a72e5806---6463038546.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a445f135c58---88153151887.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eeedd54b6---60091769744.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gk2oan13aafmd8gktp4at36joj/lapobeniwededidepufanuf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d9215354---63147399618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chlamydomonas+reproduction+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_off0000bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 17056 bytes
SHA-256: c15d9b17af6dc69f2c7b729a63efd7ce2a3b33f04bfef43231158a7b35c1717e
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 11132 bytes
SHA-256: a79f7d23a6e48ea8858daa6735401fd9198a7c7f28c95b35790a4df70c104d9a

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