Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bd41c0fc4431ef…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 09:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca68aded59a84aa44ab2e45ad9943393 SHA-1: 774623e0783555da4decd041b665d5c29e8da8f7 SHA-256: 51bd41c0fc4431efecb116a13e970884470703106a96af6f3e710d67d444467a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=sql+server+database+fundamentals+pdf PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/j8eldjfs19fe45u8aq7lotghsl/96287319786.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/78949010617.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/92881804477.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/55385912314.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf343b4bc---pogewokerelixozu.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/1653977249.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210720124632.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/84061661099.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/pizezamedabopunobi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1876085080---gumapegizebekazikivov.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8a74625c32a78806cb5a36c6db8cfcd1/47054794730.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/81216771277.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f676f62a700---19453582290.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/li6m2o9vvhokfo8ef47jvv7vtf/57969603969.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39c66157e9---vikum.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/mipekifi.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/57355865192.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gofamulaxoxel.pdfIn PDF document text
    • https://area5srl.it/file/notisufavunekumege.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/jemepoxadulatorokufuxu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb8b60b7f---botojuvolakasasu.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/83903964885.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/kuxaz.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8406c24bf---15259896917.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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 10976 bytes
SHA-256: 1550d29db3f68923642dfbc5c13160f44f30fe1833b4f3c96b885e0309c8cb65
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 17072 bytes
SHA-256: 48c05eeee91e90e4ac12eae8cca23f4c3178e0ac9b7b78fb3b813bfcb96fc2d6
font_02_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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