Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6fd04bd67a63b2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 03:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d598b1e3657679c3464ffddc7aecbbf9 SHA-1: 186205c22bcdac073ac09e55e3fdf5cfa5f27355 SHA-256: aa6fd04bd67a63b2f2ab16333d7093a86adc685743b45cf79e91345048e8e5bd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622486618d---zidisovo.pdf In PDF document text
    • http://ahkjt.com/upfile/file/turenifofojagebusu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b581fc6f8cc65a10f22206a1de17863a/69218822404.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc61cb57a3c7c9d2c42841dc82794b78/xijivepozinemelorawemi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fkeuajndt2p2qop4paa2pa8on4/89950797851.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5ccb7cd1a88f53cbf006c920fb0bfe71/woxidekatudufe.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bc2356f8676d4cc3754dd6bc25ef7ff/gupuzajijab.pdfIn PDF document text
    • http://signauction.net/userfiles/file/62185041310.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/68233719520.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160793ba42db59---73258830854.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/83664287668.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/97a7a552c2fc5725ed52baaf3479de3c/tojizisumeketapomulobe.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079278ac3cad---ragagibabufesudune.pdfIn PDF document text
    • http://apcmagon.com/userfiles/39869224709.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/84940052795.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h0c8ae773qr2i4e7i1h1nlauo2/zareletafamaviwut.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sekusapuzodozemojoxipinuv.pdfIn PDF document text
    • https://rjpexport.com/files/setikudulejowakatiluxem.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/89958271869.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/degagu.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/nolixumutuliliwuxamigixi.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/30426800858.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hag0p2asneo6es1q82strg3orp/58279050741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=doble+refraccion+de+la+luz+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_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 10648 bytes
SHA-256: 3c68c4e6425d9ebf6b3b69a04f068e2b5d9bddceae38cdd0fd0469028989e858
font_01_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 18572 bytes
SHA-256: 1a9a731a63c91a9b149730ea4f2efd8a915c2fb9318bdeda7d68c642cc1aef2e
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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