Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1527d0f761de25…

MALICIOUS

PDF

90.4 KB Created: 2021-09-03 08:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0d4dae867e7b69257d6bd0429a2afa0 SHA-1: d024ebcb8aba28d3d1cf6801913dcbe4e5ce0147 SHA-256: 4b1527d0f761de257eb11dda50945056bdaf7b9f11ac25fdab2e311f29c56311
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b50688196---99982068859.pdf In PDF document text
    • http://pivotal-technologies.com/userfiles/file/12642281295.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622431495.pdfIn PDF document text
    • https://bamor.org/userfiles/file/fexuzo.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/de56546f95ceff9da055e20dbd4f23d3/bebotatidape.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/35312988539.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/71479210235.pdfIn PDF document text
    • https://activepymes.com/pub/file/xawezemefokirovutidivo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8ec7143c271e667e3c24b4c3d11d84b3/toforezusuterumedebo.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/tufasakatutev.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/681846f28d66dfe57997e8bc2d6d35ac/60964065840.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a846444c---sikuduvovevuzaneduditofid.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/96739948775.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab89387c---foxorimagovudajipota.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8d96c7c4275a1eec2ff1e026e9df72da/nakusosedogifo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefofo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877101c2c---tojexezegefu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/61366754442.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jalerofulafinamezezaveru.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/0208d202148e2ba83bd69b94e1ea9329.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gewapufise.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/zilubukonigefugeki.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/kebuzavodusujutot.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/ruregix.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/mixusado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=allopathic+medicine+book+pdf+free+downloadPDF 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_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 11016 bytes
SHA-256: 6f3f44cb1d889658a63215353d90423db36e19c328843a24d62f5c29e16dfb18
font_01_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 19056 bytes
SHA-256: 46cef073eb67a19d9c698437120b1456a581b009ae5d7a73369415947b9b8ff6

Open this report in the interactive analyzer, or submit your own file for analysis.