Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c8a725c3a85f1d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 03:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79e80009cd7e0dd301d6013706b57f1a SHA-1: f92002a19326429e3cec43e0cd8160b0183790dd SHA-256: 40c8a725c3a85f1d27dc2ccc3ad7fa0ca41e9217bc1a73e27d24ff7e5321a7d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit users by masquerading as a useful document, likely related to exam questions, to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/852ad2d3a4e4c56f058cc04dc35e54f7/letadive.pdf In PDF document text
    • https://cheeselicious.net/UserFiles/file/77273310150.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/timanuraradite.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc01b9256---fopanefuxemewotumuv.pdfIn PDF document text
    • http://teplospectr.ru/images/files/neganikutu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/nipusulotol.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/wopowisawuru.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745a64ce982---xesovererodixosobo.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/16330006349.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/49880972516.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/nowojixabebuzajetal.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107211306365813.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/10078865265.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/xopepusu.pdfIn PDF document text
    • http://allycatering.com/userfiles/gilonemabawixi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612e31c3dbe71---94688336431.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/35926281371.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/22719619173.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0c4649c3---rosopemexanowezunex.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a039540bcfd3b2886b95989d57846962/nazizunopibakuzalivuzatoj.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/4bufhndsnm0r9hqm603irn8qd7/57761947640.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02ce1cbb4---9482609031.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210628160023.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo3bkfrc8bsbqticnqskjgo07j/fexurisasuwitevotawukap.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d606928bb5---nivezajevewafurotonipoxix.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5f037e90---dusinemotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ccna+exam+questions+pdf+free+downloadPDF link annotation
    • 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_off0000bc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 11244 bytes
SHA-256: 87c6cac1d7e1c8d918deafd805de37ee290a32dfa3f5b7d00ab3d24d4da31292
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 15512 bytes
SHA-256: cf587d5def483bc1949bacda6abc202a4049f5fe375d94ab4cee463441e8a18e

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