Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2b4b711d102b8d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 07:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1785f94ba40ac23e561bac0164a16670 SHA-1: d57a4ee8eff0970925acb674d6aa2a32df51b73d SHA-256: 1f2b4b711d102b8d30f82a11b5d1df6c45d9b29d5c031d6ecf6cb1bbe9709016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to lure users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://candbco.com/ckfinder/userfiles/files/zesititijavitojuzot.pdf In PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/99660731691.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39dd112c7---rezosuzizamerolonu.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/wadekerawojexuko.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/8774325860.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/beligazufefij.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/2543001378.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/45185299815.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/vq3p82budc9l27sr117o44m526/20803091022.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/43953819128.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wositadubeji.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/76266529810.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/dinoxexon.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/61633493193.pdfIn PDF document text
    • http://edelstar-mos.ru/files/42765728053.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ff54e1a1---71343804200.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/91153698bbedd17862d8cd5a878b04c1/pujonodogedazotelebabura.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f76e3f58a---dupir.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/15207766218.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gixoweginosemunaxunitig.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e133ecc3b979150e731c19a4dd8449e/69755189080.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/xegizupuxiva.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608723f59992a---ruruzuwipizebaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ford+crown+victoria+manual+transmission+swapPDF 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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 18740 bytes
SHA-256: ced52e9d446ef0d05d52b4987701881626a24168a2091763e98681c909b02507
font_01_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10772 bytes
SHA-256: ce87c44303d06d74860e33c4fc3b0d9d70478f24bf154614354e5e8a1d3fc8e9
font_02_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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