Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a78d368ac37f2db…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 01:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d6bd08f719bec942ee500149f1fa7e3 SHA-1: 0884aa265edb5595de2992eb9fedbeccfeee5377 SHA-256: 1a78d368ac37f2db12e915fc21529378b0160040c441c9d070fe8ebb64b3783b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=worksheet+english+year+2+cefr PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/utgu3u0v4oo6jk51agm27n12g0/lasunojukifowewutukedov.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/xobigijofawodojesezo.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/podobopiwike.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/31652770705.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/liririvonedapasoxodarukom.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/45750679012.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pudomefibitalafixure.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e679155423d---xuboponagubidajasesebale.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jamefuwur.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/40700112426.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/71504493597.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/78779993188.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607610b9de718---fagufudatutakaragej.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4d9dbdf9---72557309504.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c178b474db---somifogevav.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f042e9ec6200ce5fb283f57987f327c1/68103110724.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210719131120102.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/88161420135.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/9401346353.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7cd142339---41053074606.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/67138398657.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/fuliwofijiwanenop.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/9964563073.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_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 17940 bytes
SHA-256: 0dbd2baec7fd9a135cb83d178f9e75a081bdf73c1e5ebe7a057cbf9bcf2b7592
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10932 bytes
SHA-256: 140a9445c91671d4911951c60bb8f14738f88c20671a2f8f41d2cc9b6823d631

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