Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5f34731bec7012…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 02:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f695b01a098476ee39f45033f31a8cc SHA-1: 40b1e72cbac81cb5866e9f22a3ddafeb70dd9bb3 SHA-256: bf5f34731bec7012822bd45bce4c357f6136913f7096383d50015196f4526d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=difference+between+going+to+and+present+continuous+for+future PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd30e5b91---95155346884.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/kolebid.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/jobado.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f49a8eef3a5---panutijibidefasuzasutu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/situtumusumifujumav.pdfIn PDF document text
    • http://chikatere.com/Upload/files/87920362582.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210821085927.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/62055653095.pdfIn PDF document text
    • http://dytac.hk/userfiles/76452796557.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6088d782d3---99153124744.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/18541612440.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b673994f516e6fdca35f3969f22d1256/37802421620.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zojowo.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/fanitoxapepemag.pdfIn PDF document text
    • http://dalaichau.com/files/14249120652.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a98de19a802---21924289336.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/281a1f989120413dad3499f9cfee73e8/rugajesuza.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f45a6537c8---zisiso.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/67161498978.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9eba83eeb56ab7aeeba9e64eb953cefe/65375703548.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609633590cbb4---51140163905.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd46095160---liduzodisobine.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2ab3799812000ab63c207e43eacf72d9/dizudirozimiresez.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096043e172fa---32991295915.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 17568 bytes
SHA-256: 11460eddcc21967481db939968797b0553d95acd902f324d7da2ef9ef2ff5d04
font_01_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 11076 bytes
SHA-256: 65079cd5adad1fea0803ae9705e055377e7d60af2f5bc9253e628918478a60f5

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