Malicious PDF — malware analysis report

Static analysis result for SHA-256 9864194c7c8b759b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 15:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a08ec6fab131f28768f3a638853bbfb SHA-1: 3e49b214838b593ef5c099b79ec7258c9a3253a7 SHA-256: 9864194c7c8b759b53a9c9df7deb9062fde74ad53e078f530e0e0901534cca77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=valorant+sovereign+bundle PDF link annotation
    • http://fundacjahfg.pl/upload/file/zuzuwulavoxoji.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/dowojez.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/58072644629.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/nuvezoxaxefo.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/liburivoripibefiganipima.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/13331800411.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fa3c7362---3863597103.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zipulekudo.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/jugikowusapipotowik.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b383bc6845bc131dd05279c597da320c/banovat.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/f2vjr2a7ipdq7ol9rb01tbo5k3/31895827212.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210908224923_YnVzb3Rpbmlsb3dva2lrYXZpbg==.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/melopudozefunitomemetor.pdfIn PDF document text
    • https://hobbypet.cz/files/file/82449040750.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/316b4553eab3f7ad71ced8110aff9380/wabafawesogor.pdfIn PDF document text
    • http://only-svet.ru/upload/files/55748671132.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/32333653152.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/53749577505.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/19186632528.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/batumeloxejudovopogadefo.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/51423951262.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/77125688908.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130145392c70---41733705977.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_off0000b6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D6 10696 bytes
SHA-256: f1e5dec23bbd81126c7d6a4c17d278f28161eb414f080d4175c1c17bf54c1f6d
font_01_sfnt_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 15420 bytes
SHA-256: 429c93e7d769b7c3de1ba67b2c7fdb6f758b0d12e18c0c27e4aee4aa7f722499

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