Malicious PDF — malware analysis report

Static analysis result for SHA-256 640c6fabab33bd98…

MALICIOUS

PDF

87.5 KB Created: 2021-08-16 09:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17ca4b70f64639e1711f786a697890cf SHA-1: 9aedf58661e9dfd4b8456b5295ce964e8a5b7253 SHA-256: 640c6fabab33bd98e4c139188ade71ae5f1f0dcfa0ddfa27a60f64299ff3d11a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised or disposable domains. These links likely serve as lures to phishing sites or downloaders for further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=apache+spark+cheat+sheet+pdf PDF link annotation
    • http://machinegroup.ru/img/outer/files/nutukumunukibibarofas.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/18800561731.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/filotoxerisepeb.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/luwedosijalorarazejojik.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a3dc563a8e8e17d0660d3b2cc8fa1c77/daduzeperovej.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa8a9181e---kijiderubaxuraletuz.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/70446180738.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/mageg.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/zumalaxatefabukupewi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/92757537252.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/walezogaxekaf.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a41d7e38---fiwoj.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608501827aa31---98253358436.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100afb629b83---vavawidog.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/siposefusajimatibifevik.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f78a54c85d59fe333d8613634f184116/zibogu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822d3f4226a---55920008864.pdfIn PDF document text
    • http://vejwun.cz/images/28919807854.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2ee66cf5c627d2ec993cf38edc6a4cc8/89545024903.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8df020fd7e1f3523ad7911023c446298/tudubatufibojalimuxuvilaf.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c37dd000c7813c681e62a855cdb62963/ruwivutowewiberijukowiniv.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759c80d735d---xudofafawi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/noxobeve.pdfIn PDF document text
    • http://jaatkinson.com/userimages/rajuromenuwekak.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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 10428 bytes
SHA-256: 733f0a4e22e910379217c4dfd446d139457932132b61186669cc490608171e9c
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 17368 bytes
SHA-256: bda454b2cce0bec0384565e13ad2dbe87cfd7644507d2edd10a40ebfa5c7143e
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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