Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd07fb40c297c27…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9ebe67fdbdc4dea9d6d65a8757a62e8 SHA-1: 6a63aeea62560516face8f5edc5c783a40c36c2b SHA-256: 1cd07fb40c297c276f551d05b3bdb6cc853be561a295166501f27f96f39c2f27
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'QR_LURE' heuristic indicate an attempt to trick users into interacting with external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=swift+qr+code+scanner+library PDF link annotation
    • http://yeosingol.com/FileData/ckfinder/files/20210915_E98F7146CF3C6C4B.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/36258949841.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/zanefotugofizikufifi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148b9d705651---kufuleferijasi.pdfIn PDF document text
    • http://fitviewer.de/files/file/fusodovoda.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/ruzogulikivetexapog.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/budosu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/22fa477ee04e43281139c546e45bb44d/25073317816.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/13c80a61c3ae0c469461bc5f283b401d/rakure.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/kilarisuxale.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/minujisu.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/timetiwibi.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/20093018483.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/86937212757.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/lawizesujadojiva.pdfIn PDF document text
    • http://schubert-hh.de/image/file/lagogidiru.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/43103171216.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/47984710826.pdfIn PDF document text
    • https://magatek.com/documents/file/83698009078.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/45655220271.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nudopubarazibakagosi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/nuvib.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/topewufusorizunozemarij.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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 11028 bytes
SHA-256: 3a09d31dc2053eb6eb411b5198908e1d1beff41cde90d36f0aeae174e493ee67
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 17112 bytes
SHA-256: b373108d7392ed74311f2613aa784f6799bfed5850faa953c0dff2630a2b3a45

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