Malicious PDF — malware analysis report

Static analysis result for SHA-256 6468ed1072df5771…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dc9b89a1384ad1010955533f206c4e1 SHA-1: a2a5f9a69ea3d197393f5b11529a72ce7e620c1a SHA-256: 6468ed1072df5771d71b6b9af7eea9ab9d26c5ac5b653dd98cc973b1600005c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to disposable hosting or potentially compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate an attempt to leverage these links for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://materialdeestudo.top/userfiles/files/gezatedotitafozubidefe.pdf In PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/37598095197.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7b1a7e9ae491c777fda79681efa80388/jakifuniguxazadejugefa.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/59141147810.pdfIn PDF document text
    • https://ptogel1.com/contents/files/96347958976.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jiwinopotegedajawi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/bosisovoperatu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jaredisegilolexi.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/72368335998.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7tugmc9rg9jlgelsk6uq6d9082/65121079253.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/24354430677.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/65494458211.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/78510367385.pdfIn PDF document text
    • https://agros.net/uploads/file/1721377315.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/90756543.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce18e6f4b---93681364251.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fofedejapetotetusaji.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pofogulevebejol.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/26440763736.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/tonafiguxasorara.pdfIn PDF document text
    • http://xenangheli.vn/public/files/6917217159.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/75152272113.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87255506210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dual+app+in+miui+12PDF 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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 16664 bytes
SHA-256: 971b19eb0bd27805270303592f565ca688c46512d36409233a40bcb3e3d339df
font_02_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10068 bytes
SHA-256: 676d496f8c959d8adcc31ae64aac7733483ab0ee2e038c7c1934b617ae57dcff