Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dd65394ac94009…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 03:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b924f900d8ed4973c4df36f8bc0985c3 SHA-1: a395ebadf7b07fd82603ba1649f8a505caea64e5 SHA-256: a5dd65394ac94009f3139f643c538da2a19360f7d4993c44e7d027c8851bc326
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=telegram+group+call PDF link annotation
    • http://kalikraft.com/images/file/19298787791.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/lejoxigokuwo.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/motadekoziwonuwesogebu.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109132126313834.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/84720616434.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/wiwawunuzezidixogez.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dewumomunemabomukase.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90cc8a25---35648379943.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed042a8220---xizod.pdfIn PDF document text
    • https://iwistw.com/upload/files/68398528752.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/fujude.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/91808314024.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/mawabiku.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_F00692BDCE44E234.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/pekin.pdfIn PDF document text
    • http://leguido.net/files/nafalolefozewusizo.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///nubufinamawos.pdfIn PDF document text
    • http://rsentco.com/upload/file/40123535474.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/manevapelapaxazog.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/84702455145.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccf474288---86015054875.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/24210138301.pdfIn PDF document text
    • http://chinazzjx.com/d/files/jusukefevowab.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/luvezij.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/29964771922.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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 10316 bytes
SHA-256: 1dc6817d6d30272f2a7c75ad5797a7e485d37d9841ba02f8c124c1c28a2687dd
font_02_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 17348 bytes
SHA-256: 758ab35dd65bde871db88d0423af98d3bafe7fff30a07b481eb6f4ef1486c2ba