Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e36309760ee41f…

MALICIOUS

PDF

82.7 KB Created: 2021-08-20 01:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed938c51efbd598b829f493888e553f1 SHA-1: d934a6b4a0c34125d44b91a143664b7296722577 SHA-256: 85e36309760ee41f5caf6ebdf1c3d9ac2cd91a51cce7fac584334dfb21a39d8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=is+the+tabe+test+hard+to+pass PDF link annotation
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a82515bf76e---fudegepuxin.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/51862016314.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/70761598060a5534277875.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/48923677501.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jalomepupifoje.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8dafb11a0---68586933321.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3f7b459e701133e5020d896c23d003c8/94318930320.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/22024089814.pdfIn PDF document text
    • http://demkapi.com/resimler/files/75333182944.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210704_98B0CE75094B549F.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210816052846.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af5c1210240---wezuwekuxabamofevij.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a969650c1---wobodagekidu.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xonuvodud.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/64824913758.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-14/20210514195348471831.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1fe4d99a5---dininevigeka.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/13205722924.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/jexinubeparux.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/lewukemevano.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/80420652461.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f88b8942ec2---lexar.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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 10336 bytes
SHA-256: 9969816d8e4c91646f9dd67ed95836ef4141e3f39ec843e459768105adcbf82e
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 17380 bytes
SHA-256: a53ad2d90c8b95f3051f823ac4b7aebc7334ea81ae2233bc9c95e2fd701c594b

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