Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f6742abb350d79…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d0cbd31c09fe52077be459faf18fb37 SHA-1: 3b60d970695a3630ada31748d9ab942754fd9054 SHA-256: b9f6742abb350d7900a8384f23fc7c844332af0894f3bdf0fa3233d128d83fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=the+shining+pdf PDF link annotation
    • http://argyleliquidations.com/userfiles/files/wubabo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613513ebe834a---27569430358.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/50101302442.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jujijaporomofixomuj.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ea29706ba27b4e52a2f2d04aa147ba29/fawunasuwijelinoru.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/bukikesi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/bd15cd6a12afd51f59fd8fd83579704b.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd811b846---foborifonesudetedoxed.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/popofozexevapu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/49368937683.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/kezurekivawufibamibijirov.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/14827567010.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/dewinakoromikefu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/58713096223.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zirekopapezutikasivi.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/dipimigupedopudu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/511093eb0cf9316980d6cb394661fbae/8708362889.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/65491722720.pdfIn PDF document text
    • http://fpole.ru/sadm_files/vimikatozuzepekumaxur.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/13330709841.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/36230253251.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/36a1234e0454bf8fce8d23ef1c91704c/gowunuzetufufazopasoni.pdfIn PDF document text
    • 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_off0000b9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A0 16248 bytes
SHA-256: 21eea3d11e2a3b36f7368c180a170b47afa437350d8b3ae142baf84cca0ab798
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 10216 bytes
SHA-256: af89261db1208866edff57329f01725c67f2dfc6641c0520dd30bf9eeac49f39
font_02_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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