Malicious PDF — malware analysis report

Static analysis result for SHA-256 735acfa126207ad0…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 02:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2a3317d0f198939ca3dff36a2bd0015 SHA-1: 7efd68d13b4cf5e11ae1b62e5a1a2336cb1e32ac SHA-256: 735acfa126207ad09e0ae4b2f94b4374dd465f6276406bd72d6b3dff22feaa09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://kahounova.cz/userfiles/file/9711106144.pdf In PDF document text
    • https://amitadevnani.com/userfiles/file/39127005643.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeae032c67---wogakadisesivuz.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/79878512003.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c067e284a654593a5c1a86649017f082/47083492407.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/xurubazufepesosimez.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c62670f1---23216585914.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/suxofosulavapefofuva.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/wisefudeze.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/lujeneboperufiw.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/bupujenuzizokuda.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fg4baqh3e07g9nlrfom5ivee4d/nokelewunumirovid.pdfIn PDF document text
    • https://plasy.com/uploads/file/18625276138.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/36084441289.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8c55cf04---soruvanajawikibuxogomofop.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dtutut45mk3cgoihsillvqp24t/13918595217.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/de40e4de849b1eb146f77a1c94167a86/xojokara.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/rifijonutam.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31c245f30---83037976879.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/94506872544.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fogutake.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/91740334247.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/83155695604.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22598d233f---tajubosadimazabotax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stages+of+classical+conditioningPDF 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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 10624 bytes
SHA-256: ee2787ec5806a0151a599f0d6c66839127e77ef39a03b88528079b0efde454e5
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 17484 bytes
SHA-256: bd34d5daf7a16ca3585b11c2de6001d60ae8079a8d0cca13934057b3824cbc58

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