Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53a009fb70e6b61…

MALICIOUS

PDF

66.3 KB Created: 2021-09-24 18:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41856adf6181c590641c691b9917c93a SHA-1: 9c3d1c4fb2161073a397cfd7b99966227ff8b527 SHA-256: d53a009fb70e6b61e53d22c71580aa3d185c727014ec37df860e168f26edee51
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs an image-only lure, a common phishing tactic, to trick users into clicking a link. The embedded JavaScript and numerous external URLs, many hosted on compromised CMS upload directories, suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=teach+yourself+czech PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5ba7dcf0---duwususosuko.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/mitiwekorazimom.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/vugubofipazibaxivajifejos.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/jexunumisu.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/palamekubo.pdfIn PDF document text
    • http://lagrupacio.cat/file/guvabuviwemulapup.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sipapilajuzedorabepu.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/3374578909.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/75715475326.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-9/20210909051628680953.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/lonurubatenejaxo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d056667a95095e001c37bb8879358f54/rejatafedemixusulafi.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bidekafukozajojedajav.pdfIn PDF document text
    • https://sitarasign.ir/data/file/6275142989.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/91691877316.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614173944746c---molisoxogufotu.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/53554498096.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wirofujunarusibak.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/88193336824.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631944856.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_off0000aa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 10376 bytes
SHA-256: 4e85153466be65e9c04b3404789b1ea95cff01983a8a9f392ead702591ff2d2a
font_02_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 13980 bytes
SHA-256: eb3ed1ad0a374c5f07e5ba463af641bc947c6d9cbf2ee8f75f08b3923f06a01d

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