Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c4c58be1abc1ce…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 23:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 257e03520e67314df14f905246a6f05a SHA-1: f18177c88e95b7b08295baf8f8f91bf203834637 SHA-256: c4c4c58be1abc1ce06b760db59526e757d026b2067dbba409008cd76f48b1810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable hosting. These links likely serve as a distribution point for phishing or malware, leveraging the PDF as a lure.

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce6cf07fe---rusiwedawesumosesemif.pdf In PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurexubetit.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ab6d40522e1fc1509737b2de95157fbe/62634918068.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/86978052121.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/xunejel.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d22516708a5199be0008358ab567d23f/58771193904.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aa268fcc1b6496fed0f6bcbeb67afa9/57379720517.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210602_14945D1A0D59D5CF.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9463j3sofc1rvc8jl41l0uglb0/foxadeso.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a38ca51c6d76904b5834b19cfb5385b3/44012387201.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4222f2594---65176458468.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ba938e1fb792dfa956be44d4064fe83c/zovegavoj.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16256258849737.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/48748023616.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/39789503559.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/ragoxin.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac908695f---japotenazotozetu.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/50302282715.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/ripupalopozon.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073171c23151---45782776357.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/n2hmso4e79v7gukf4o767p17td/revupafu.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/tokuxom.pdfIn PDF document text
    • http://seeandhearbetter.ie/img/shop//contents/35879484386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rmarkdown+pdf+render+tablePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 10760 bytes
SHA-256: 908e4064ef882ca13d7460a2141bfbef8b24a9f7a44f1b2e35a6f19009c50368
font_02_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 14924 bytes
SHA-256: 4955f2e31499b45b90ac5fa74e834ae4da6d5c30ef22f2c4219553a6dd7f8b44

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