Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeeb9afb1711d3c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 17:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a94f0bfafe838787d94d12ffbf58d1d SHA-1: 2c0053a3b1ce002f2ea0b7b662764f9f7fb0748c SHA-256: 4aeeb9afb1711d3cbbef94f30112640b578c4e2a29fad8eaa7638984be6e39c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

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://maritime-models.com/userfiles/file/ruxaja.pdf In PDF document text
    • http://munnartourism.com/uploads/file/wisetilexosegagunitotel.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sunikiw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hr80k5pht61a636qbk84401fgs/japamiberagibadubor.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/11257391831.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/59381130470.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/gesufedi.pdfIn PDF document text
    • http://upakuika.com/img/file/dujizazudutos.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/99276968236.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/dofogazejukenixijewe.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/10394940263.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/96340704844.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210902235353.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-16/20210916035243683453.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/236e8f0e8bb085b7adbf4f9de15969ca/84379511396.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/54022012136.pdfIn PDF document text
    • https://baongochoa.com/upload/file/sunolisuzuvixopivofosuw.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/9427097966143426e764f8.pdfIn PDF document text
    • http://ahchala.com/img/file/28798143368.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/xalazakesixi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o2pc1bnahkdt99dp2vj332dr92/jobutozisoduwenomipi.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/bazuxe.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/levepirenefekotup.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/nofuwulupojavinok.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/fizipejirexibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vpn+internet+apkPDF link annotation
    • 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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 17068 bytes
SHA-256: 5de82bcf3f1a5aef8ebccee179d16cd1f248bbb51f049d9743970b2b44450412
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 9972 bytes
SHA-256: a05bb228eeee0c25885af5e7065c5325b480cddd1a4a3dab4e088ed5bf2d0489

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