Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd1f25901a58d5a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 22:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84682ad5bc2ca729c0bf522b9c74c5ab SHA-1: 1eeb423647f199be3743db64441a2646d122181e SHA-256: 7fd1f25901a58d5a561e834c1d93336ded2540166e0e47f1da15d5f6518d50fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm or phishing attempt. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=how+do+i+get+emojis+on+my+android+keyboard PDF link annotation
    • http://net-marketing.hu/images/files/jesune.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/29490053231.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/nezezolefadanubobaxavave.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/boxubejuri.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/besediwulaganoraxulesi.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/repoderasejedopitemik.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/ridirupafedogubab.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ab6d5dec---kufanifiwaj.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/sotivowekodo.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/120750476719.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/12592231195.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fa1c4e90---69523422192.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/kigakuzowes.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/5514236730.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vovozinafi.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/54045701963.pdfIn PDF document text
    • https://costarica4d.com/contents/files/furupemedis.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/kiwugar.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/23263132754.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb38a9d98b---37325114575.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_off0000c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 11096 bytes
SHA-256: c07158a4508d3f050e9071637475b7ba7507b8d951e81b2c6274ed56aee19a3f
font_01_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16796 bytes
SHA-256: 9718812c1fc6348cb1967f2647dbfe45111b409fd00975df8b9562dc94fe4507
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1