Malicious PDF — malware analysis report

Static analysis result for SHA-256 d831bbeb44c6ec50…

MALICIOUS

PDF

135.6 KB Created: 2021-09-23 08:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e19856cb52d6034cbb8a86b1cc51140 SHA-1: 5e20dd376107ed13fdaeb1fefe75d539c17f8ab3 SHA-256: d831bbeb44c6ec5076775dc8fdefe84ed5c9180c9bc555b769abd2a32531a1cb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency and password-protected archive lures further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=mobile+legends+map+hack+2021 PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54ae67256---18733688099.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109220435374533.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5e207ef7---60400957718.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149126c0b79a---97687183864.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/puzutisese.pdfIn PDF document text
    • https://eternalbliss.net/file/ziziduvoxul.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/8703982499.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/57591510705.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zepimifetezozari.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/vurukalejabigadofu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/noxapuma.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161319c7a85dac---93635475386.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b79e50f078---18726879130.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/7211595064.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fe2cf341---refamidawakirujeduvom.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/jokokeguwelodiwupidejig.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/tofegarara.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/89370215795.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/21825144949.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4122f3c6---15764058265.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/nategezoxowidezepuvajuro.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/lewujikagoxasuxafufexot.pdfIn PDF document text
    • http://ipublicity.cz/data/file/99745276683.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lovizanuzavunigakimasa.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_off0001a976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A976 11280 bytes
SHA-256: 08e67af1d13897f0df2db11cbc4425b7a3a9df14f1c2764ba03c42dda3e85c2a
font_01_sfnt_off0001c35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB6C 20068 bytes
SHA-256: de4f732103fde1be63a7dd3a6d309d526f2f037dc073da079785a489bc39c9be

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