Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bee5ac92d92e41a…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 01:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c615eb50a56298a4120a868152df833c SHA-1: ad1da0d39d223cbfab927f1da803704ce15afc06 SHA-256: 4bee5ac92d92e41af8e68888a65de40983c86272e5a4fe709cc073e6d97571c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, some of which are hosted on disposable domains or use WordPress upload vulnerabilities. The primary purpose appears to be directing users to external resources for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=arnica+for+sprains+and+traumatic+injuries
    • https://universitecentrale.net/uploads/FCK_files/file/babezafisesuv.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90648284f---gekuvaxerupadaluraminavu.pdf
    • https://novahealthclinic.ca/userfiles/file/pofenomovaxabekuvabolurum.pdf
    • http://kvbm.org/pds/userfiles/files/judozuwenalirebiza.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9e62170ec35871beb8464c44110a0520/pumaparunejexur.pdf
    • http://gptools.net/userfiles/file/60218068741.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d24cff745a5---61607247928.pdf
    • http://aitrans.cn/UploadFile/file/F1202106260557088581.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab9c4162458---78662204690.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5464e20a90f676644515d3807fb19667/44396666606.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/09qvkg9p7u8ovi2aepd6irjdq1/83677396190.pdf
    • http://firewheels.pe/userfiles/file/74994897434.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b74cd197bb1819ed5440dcf595b510fc/67645958660.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/zugotukugitaniropu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf4f7f1d3---lefabudafadekije.pdf
    • http://klpa.net/userData/board/file/nelimixa.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160beb6f1bc763---lumulurepipiperodibovuwi.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160879aebe5d14---55455868801.pdf
    • https://chmelo.hu/sites/default/files/file/dominewozewevadokezamuwuf.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/squmuaumpld5g0vugram9n81c2/litezujawobe.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/40517cfd4f2e5d083d62aff8fa074ccb/sexumitopa.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/033bbe1d989eeeaf75119407d0b49fde/tumikowaxudokojeg.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/39e41be96636c39b539626f3748d9402/17760475316.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/a36tqh4ke58d0gv3c1rokir8en/60920726463.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 16792 bytes
font_01_sfnt_off00010441.bin
ed65f5817b1dc34df66cf1576958678513c4db058ca8fdde78434982dd5433aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 18116 bytes
font_02_sfnt_off0001326d.bin
6f7a14bfdc711235481f61ff6215f8222a5219475869d4064e844063a516afd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 10948 bytes

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