Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c705cc4f5ddc24…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 17:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a1d9042c23a8774af0afa0dddd6ac99 SHA-1: a6be565222f5a23f4c29507d78d44792735650f6 SHA-256: 22c705cc4f5ddc24261a39e9bb5b836100d00680ab59219de2ba8965774ddab5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The 'SE_CLICKFIX' heuristic suggests social engineering tactics are used to trick the user into executing commands, likely to download and execute a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://coretry.ru/uplcv?utm_term=pdf+scan+software+windows+7+free PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rj31q0samcd45qtniqib442t9l/34561110758.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ca3905416---jovigu.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/38094452600.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/guzuzupabukefobigitubek.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610006ef48bc4---2125878260.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/96654471229.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/lilof.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9b225c94---8732590478.pdfIn PDF document text
    • http://dzbnf.com/upload/file///nunuziketed.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a52c918fc06---41796269802.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/7350898157.pdfIn PDF document text
    • http://alltechsro.cz/files/17251053286.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c2a30a9a576a1edfc1e15dd00bd69995/34038707576.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/vodogepotedadudidexe.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e6e79f7f693c37f71c225ccf2e629f1d/46088888389.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/jenasobaruvojowuzutokanor.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/51165988032.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/74957668476.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e718a8eefc---gesevekofedujumosuxexob.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc7b6034f---52808909578.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/25435370557.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d810d47---wenonukavetaduf.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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 10560 bytes
SHA-256: b0eb8885be2b30a4a50ba934e173db392002546589a7d4919566992c5e0a68fd
font_02_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 17312 bytes
SHA-256: 624aead5867e621a0360760249a2e0eec5724dbaba5200641890838f28e60aee

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