Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4dedf93256e35c…

MALICIOUS

PDF

81.9 KB Created: 2021-08-06 23:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2186e20897fd66245b80a6b105de9da6 SHA-1: b4fe3b7d8aee7b352e3516dbb7b5b3f6d7dae0c4 SHA-256: 0f4dedf93256e35c83d7d44b875fa1f94de1977fb66a1518b0b24fe29516e7bd
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple URLs, many of which point to compromised websites or link farms. The heuristics indicate a high likelihood of malicious intent, including a security bypass instruction to disable antivirus software and a visual download button lure. The ML classifier and ClamAV detection further support the malicious verdict, suggesting the file is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fnaf+sister+location+free+download+for+pc PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c664658c072---17378489656.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/rolarenanajevuvi.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/demokeda.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/bogoxadijirek.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vazimutakuridadufep.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/70010072814.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5b445ebf---rawuped.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6fad9dd52---gavexuzolev.pdfIn PDF document text
    • https://ovalpolycoats.com/media/17615541599.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff735ddb19---valebewewumo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b396a0c24b7---fimujuzonumupitorobaxob.pdfIn PDF document text
    • http://haki.vn/uploads/files/tefikimekipevopikoxav.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/54371417112.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/burilatituzin.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/divumewixekilisuzomewowis.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/41dddc5dac53e9e969a709c16a2a8499/dotowe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21d584b1b---xojupapazudirujanud.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/66255915265.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/vexoviz.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57775789179.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/38244764949.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/k1ic5ork0jcomf18mrgolblj77/27166424706.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/44129796989.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/94b2108b6040b473e90b2fb5925ee0c6/tafupora.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 17928 bytes
SHA-256: 60266a71566ec79f81a7d6a200660446f8d46a59c140806fde292958697876c9
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10676 bytes
SHA-256: 1ba08ec7f8d7bd20422c0e8d99d23add3c5004e1bb62ba327204e97b80d89980

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