Malicious PDF — malware analysis report

Static analysis result for SHA-256 0155a4e28b5b1a99…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 09:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2156f4e49f39747c0aca52d14afe97a SHA-1: e781c39fb750923572d95b76d0e41ddd75b04ffd SHA-256: 0155a4e28b5b1a99b2810d2cc964c88cfade80bc6b5ef6c71621f500ef9a9a1f
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack, instructing the user to press Win+R or paste a command into a terminal, likely to download and execute a secondary payload. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+install+apk+file+in+android+mobile+from+pc PDF link annotation
    • http://baove247.org/upload/files/radakew.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/70884000164.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c7aaa2bb---tejeno.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tutoziwiwolewaginotofoze.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc38166f8---zinapixoxapoduvivuz.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/41095216576.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa36a53517ec8cbe1d6e51ffa0101d22/23875894807.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/65719617133.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/57671761051.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109121150341462.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nagafovexafu.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/36380665240.pdfIn PDF document text
    • http://asja.ua/userfiles/file/lemurifepukexabifijef.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/82698781369.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161417f66d55cd---15520875368.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/90226768787.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/tukoxumawilizanub.pdfIn PDF document text
    • http://apismorava.eu/docs/loxorekutixed.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302a153261a---vakebaw.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f6e1fe70---95257357264.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0c9e350e---21154412488.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/35041920986.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 11092 bytes
SHA-256: e385ff915b5abaddd2b6f6adee0ef4ebfd03895e73e77ea2c99eabe9d778a08a
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 18104 bytes
SHA-256: 088ad325a32377c910d5eea9cfb881ee3f9a2c055b849eb31d07e806ecc5d7eb

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