Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e806c668365724c…

MALICIOUS

PDF

86.9 KB Created: 2021-08-11 14:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f6699d044336f93fbacf7a341bf553a SHA-1: 199cd326333c5fc53da4c43b470a225732b99933 SHA-256: 8e806c668365724cc9290f73b73246675ab3cc7122d73a540ce93efbdad1d927
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=9th+grade+reading+comprehension+test+with+answers PDF link annotation
    • https://anfauglir.com/images/file/99107051149.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/mulekurujijumevozejusenu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/voxulemuwaju.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/84attskoi99si60kd1aams6qlk/doxov.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/wupebuzo.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xoxazalamodilaxomajej.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/59098657971.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/42587959635.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/08fab8a8d9b0d9cf26654d470e2bc796/48619075813.pdfIn PDF document text
    • http://polletnv.be/uploads/files/matupotawujo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/32279594854.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/15823653079.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092110adcdb0---23204922587.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/xopifesufobolod.pdfIn PDF document text
    • https://projetovm.com/uploads/files/55848712897.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/laxife.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/pujorizaxomunabavovenufo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/tutagajujuwar.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a273294e9e---49425931443.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jajekixekopa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbd172653---zawerakexawapezu.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/53074064494.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/nevede.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 17400 bytes
SHA-256: eb76bc5a0190e35d99d303d12934e4f0fff2e7ed4a29aaf8152279f18262a06c
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 11072 bytes
SHA-256: 9c7e6b18fb71dd0ef9e308799c372f4b7d353049fbeef097b75321431f6a0b59

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