Malicious PDF — malware analysis report

Static analysis result for SHA-256 2696a799f369be18…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 21:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec06cb22ed6c38db884ef5eb19350c79 SHA-1: 32f1f04503e4c507554ac3eaffb2f92913ce018b SHA-256: 2696a799f369be18cac70233e1bf6c4fadb69c01c0d19afdffa4b6b88d31bd7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+5+data+download PDF link annotation
    • https://rougezenekar.hu/files/file/datobuwoxulur.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/45714351114.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/xosuzoneze.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/5716746705.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/betibegarukepotegaxubod.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/66123683800.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/88119145366.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71e2eca43---nolumalarusowakuj.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8094b6d62---foxumevuxogaxizinilolo.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kazoponowopoxi.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/76484217826.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/99372065026.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/27251403862.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/vavurorijabe.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/14815559634.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/dubumibevoxubujer.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/sirekuxudurisatadisipi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/sugoxonokobejavojomi.pdfIn PDF document text
    • https://blogsma.com/files/ginoxularezomilotaladi.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/26969294695.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/gamofepigikukunutikizuba.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/paxanitozunoxep.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f0316e4c4b9656f5dc2a16a310aab264/bekaxopulowamujigik.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090107185973499.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_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 18876 bytes
SHA-256: d6feb794a2e01e5d721ef322bd330b7be529988508db663c450d5c59c97031c4
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10008 bytes
SHA-256: bff08801a3239c1fd60e1a6b08d7080c58b9c974e27f846e07da8cf46ec71df1

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