Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23d8a03ba8f78d6…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 10:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66e5e5fa054273b92396fc5d101111c7 SHA-1: 6f1ba9309ae9f8043435221f13fd9ceb3deb54f2 SHA-256: d23d8a03ba8f78d6acda2fc5b2b6bcfd26eed05fcd9cec1248bb26c784081283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many hosted on compromised or disposable domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or tracking mechanism. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=mug+life+app+android PDF link annotation
    • http://chemicalengineers.ie/images/vizisaponixivikamulusubi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece489dbd4---26008211186.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/n1ae4q0rj7vk959jjo52dt00ha/90121039082.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/31854685912.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061820041041.pdfIn PDF document text
    • http://julianina.de/upload/file/zozibakapiju.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/46291182707.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/42867878838.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/soxan.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/reterixugafap.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/63132834725.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jimage.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/85517933240.pdfIn PDF document text
    • http://bscartridge.com/pic/xafuzesam.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/toxekufuxeridij.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/tejusozozorefavi.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/3850682838.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7geb9go83ha0isca8u074hudu8/7975348530.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/80838724857.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/28108236026.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8efb8002c---44702904479.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fidona.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/pirujavonegolovonakobaba.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/61739678697.pdfIn PDF document text
    • http://packamate.com/userfiles/95989853414.pdfIn PDF document text
    • 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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 17948 bytes
SHA-256: a130900670dcbd9e677a854bfb9dcedd236e51a132dd6f6071e3629da7d42251
font_02_sfnt_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 10500 bytes
SHA-256: 7e0bbfed3d6f307a9ac311dbb7c70d852794f2c88e909fba343f5f66394d9f1f

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