Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11111a09cf1e935…

MALICIOUS

PDF

130.6 KB Created: 2021-09-07 02:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4213e1b172c37bef6a2582f3a4f926d5 SHA-1: f0e7cdffb126aaf87b14426a7bd9abc96f8d2b13 SHA-256: c11111a09cf1e9351597501af6c381a96e36e69704d55b57d5ae34291584752c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://notariocprietoa.com/notaria/documentos/files/bezugidesejo.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e5141db229ba282b1acd9e02376fd86/tevegibaxifekidilikub.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/10543364608.pdfIn PDF document text
    • https://kaimano.it/file/raxudamuviverokojofiku.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/de007386e585e234c32ee3f1ab33edde/25098694740.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/85890997024.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/56449600900.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/70574923182.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084acf703e1d---podososope.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gopizisolejemapinisu.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/71035513097.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3a4ba6d8d310edda1911dccebbdc32f0/novamone.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec47d837fa---fedezuza.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e025b804d---wenowugijosa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180417011311.pdfIn PDF document text
    • http://kgmda.com/upload/files/raladudem.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/vupebosenafegoto.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vovojifagesurupekozeduv.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96712903990.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/59947249388.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93360689285.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k7p2tedup64p619vpbhgnjj3q4/49863244407.pdfIn PDF document text
    • http://btcauction.vn/hinhanh/file/90173539388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=critical+discourse+analysis+article+pdfPDF 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_off0001983d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B054 10860 bytes
SHA-256: 464e49f7cd8a9270a529dc75b366e256976a829a7b3d68011a69cbe2380fbc94
font_02_sfnt_off0001c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C998 19456 bytes
SHA-256: fc166a53a04d3ef6ff3bdc69a912298f93ec3cbf244557b75505f292329a5d78

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