Malicious PDF — malware analysis report

Static analysis result for SHA-256 187ca172d3b954e8…

MALICIOUS

PDF

125.8 KB Created: 2021-08-17 12:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0a98b8fc1700f69752f45e87bac6970 SHA-1: 7341fd4e279790bef766afff40c3a022e70a6a9e SHA-256: 187ca172d3b954e80fbad412e495eb1a5a9ec29464f03a320d1b317c4bf9e99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://emprenderem.cl/files/derej.pdf In PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/37966138478.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181017314462.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6bc0f031dc447e158b2eaf017a691cd5/29908537648.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/jefenek.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/sudivubuj.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/55976535078.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/tarepilera.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/46776763498.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa0b04d92---38869944782.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916c31b9fa9---72900667315.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/6347607515.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/37080955347.pdfIn PDF document text
    • http://headrepublic.pl/images/files/80795894485.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/zoxav.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/81702565415.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2a66667d7---nakosemimulavunisof.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4923c7f907---pinowumomifozi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ba8c0c710f8074832f402cc9d343ff57/93287850543.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba164b16096---zasukekizona.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/gudapibujipojepajuj.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/35408434206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lista+de+precios+cklass+2020PDF 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_off00018c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4D 10692 bytes
SHA-256: 588a4ba2284f9fca7295d58c980063539d71f4eb6d8759a424dfe92111489c08
font_01_sfnt_off0001a4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F5 16536 bytes
SHA-256: ab275f8f150123a50f932b11ce20a28bfcf4cb6478f1be61982a986881f8b22c
font_02_sfnt_off0001ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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