Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7991b2fbd77e8cc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 08:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3f87237461e7b6e43bb71d301f130a2 SHA-1: 3b8b37a53177c66a038893fedd72f5abd52fa243 SHA-256: c7991b2fbd77e8cc4e71e3a4b2ab3f0d1ac4af16f31207343fb70e725ed2401b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further payloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a75cd66ff---95888882402.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a62c62f4f---94705182821.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/70184106679.pdfIn PDF document text
    • https://jurad.eu/files/file/busone.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/68ac91fe29236b24917a0a388babb025/wipavagefobutadogatozotus.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/83896825721.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/43231679612.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a0313b87---5842222632.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/69030200258.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/16486586267.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/fovuzegizejigixaliv.pdfIn PDF document text
    • http://fotossc.pl/_files/file/40431938443.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/selafinax.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/gavigigib.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3300e2018b---tukumiratoxirotomekeven.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/33528741674.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098499b8e56f---19018571407.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/37328ef9085d7f043c33961197fdd7a4/26866566657.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/gukezetusarewevuvape.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/30351849381.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/07b755cccf1efd67749bea42eafb32a7/jabutegijokelerolevani.pdfIn PDF document text
    • http://willbramephotography.com/pobivifitesabenu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc332a9b2---34890984946.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e27e84989323a729ce4110a48253f8e7/jibelotob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=human+reproductive+organs+and+their+functions+pdfPDF link annotation
    • 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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 17580 bytes
SHA-256: 1e0084246d304183a4951a2dc9d3c0feda86366fcbc2a6c28cc0ae9d57b91343
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 11180 bytes
SHA-256: 6f1f4fe4a87c9e90fdda2009c1f09aebe279bdd66552c19e2751a8a80ccbc831

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