Malicious PDF — malware analysis report

Static analysis result for SHA-256 b227762ebdcdb2b5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 00:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a21b83c58f16f60fa6909a84be62200 SHA-1: 7e2208024224477a5620a178b690b1c4dbc391db SHA-256: b227762ebdcdb2b5c45a6ac424d619e0908fc86822d1e401c43db0c5f0503d0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=yaskawa+ac+drive+l1000a+manual PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3d006142---61349898838.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/55413546522.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/6241552070.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/144786e378c3b1273bbb255b36f4ef22/67163221621.pdfIn PDF document text
    • http://cityfate.com/files/files/10673687748.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/15287987548.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611561db92673---timofafomolonevum.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/70937883057.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/liripidupaleretuvovidi.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/girowadi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e6dfb87bd826d47e87c1dbff1bcc1680/dutepapidowo.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/petodimefagexule.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/kubedavojali.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/dqtc560a9es48hg8phup7gk8hi/92588514220.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/14521651402.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/11447521475.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/d5t7g6nvp5udebj0jftmk4o9dh/39852793177.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/14601916789.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a42c9666---wenixemizudosefaxagasuke.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q68hpckqbfqiktdetrjsn2shb4/91839288531.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/7b259d062b3e9262d2acafe9b68e5f9d/26268574534.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f6c8394bd158c7120d344bba1022827/kilopejugokunisoziw.pdfIn PDF document text
    • https://mmtours.si/uploads/durikutuzuvegozogoxop.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_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 17376 bytes
SHA-256: eb27542cdb4ce0bcfe26390f46ee915c2cf5cc3d84952a30b6d8887e048bb848
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 10812 bytes
SHA-256: 8236be27424f806e43b2eb81289106b2a826eae34bbc36b1577173672b434513

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