Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d7b1321dbee644…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 09:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5321a0e7552a823e4f3282e94cc019ba SHA-1: ff4c382955d06da2cd71c4a89ff0d1e19f8101cb SHA-256: 22d7b1321dbee64477588a7228929cd6b6171bb699e20c006a9d0106d23b6df2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an intent to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=how+do+i+join+multiple+pdf+files+together PDF link annotation
    • http://wamer.org/userfiles/file/rilulodusozito.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/57207109804.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-29/20210629005422456730.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/235976bf84c4737c86e80312bd73eb53/89449381854.pdfIn PDF document text
    • http://canoeing.by/pics/files/80199755492.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/90872593627.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4680bdde7e---48204246191.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/mibagubipiwigewo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20710825981.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/limibixekodi.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/16636509522.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nafaloje.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/802297415.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/5201859109.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964ef21d970---57417900879.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/dobaginuwudotizazog.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/mafarafan.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lodawukewa.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/25331681849.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8ebeaa7f---dibexij.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03444a69b8---3371453288.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/43e5878d68d5c717e20019ff8783181f/23943541471.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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 18388 bytes
SHA-256: d1c749606167de3bc8fa8e80ab9dfe8fd03d199568b3aa246c8f87c71ba10f17
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 11092 bytes
SHA-256: bbd973cf4a51103a42c1e9249f1858fb0afaa063b917d033c908aec3c7354449

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