Malicious PDF — malware analysis report

Static analysis result for SHA-256 74266ae608976273…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 19:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9f48781149af8fa18573a4b66d941b8 SHA-1: 656320763fe149c2a3ed707b84fdf8a0c57c8d59 SHA-256: 74266ae6089762734b60d4e488023b56b8b82d92a2136819fb703567a4211015
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised CMS upload directories. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to evade initial security scans. No scripts were extracted, but the overall structure suggests a phishing campaign aiming to deliver malware via password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=rar+file+convert+into+pdf PDF link annotation
    • https://bodzlomu.com/userfiles/file/93959995898.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/5477115169.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/nefenifadeferadupofami.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/dimulezolimisikasisitomi.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/lobeg.pdfIn PDF document text
    • http://firegallery.ru/img/upload/majamujusod.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/netijopekujivosiwazivew.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71935599511.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/eletrarbp3tuhbkurledmltpqr/dokonapivarawisitaxupevu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c819b772f---74837328704.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904012139.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a2ea6dc9dd329ab30fe43ab3c47865c0/99260232033.pdfIn PDF document text
    • https://panama4d.com/contents/files/59960292723.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/60124818003.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/21515201129.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/49150078769.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/masijudu.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/6214907390.pdfIn PDF document text
    • http://inphilong.com/upload/files/xaneginafalamane.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/migaz.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/17535932238.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/89606290300.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a612dd875---83785523543.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wagaguxitutemejepebogef.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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 18020 bytes
SHA-256: e88067d6d4b2323b5b8d6c916be5a1720aacc4ec9ecf400f7cda30e09d6e7aa0
font_01_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 10556 bytes
SHA-256: 6fca698a23dc3bff07924f4e1463d19941d472324ee13ba1a41cb90d4ee093f0

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