Malicious PDF — malware analysis report

Static analysis result for SHA-256 e608cf5d22c94940…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 03:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d6ec13be5b76a5e8e9d855508e81973 SHA-1: 5f7eaf4a300b11cc11a213487b4747d82a369b5a SHA-256: e608cf5d22c9494057a2f1f014b2e75730e68b5534d4d5eef1013966c5fa6cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ajansnigde.com/resimler/files/wedobederetalo.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0defec4f10791a3ad65ddeb107376021/zipabovuvaw.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/25920652237.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140d48fb5ee4---sikisimurivofafigazalidu.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/47161541767.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/50939e6922b828268131bf7073d22447/15150697269.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/sobuxizibunopenapepobipox.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/godekalepejaxopuxen.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/tuzunoxasafo.pdfIn PDF document text
    • https://777mto.org/contents/files/36566281414.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/80735077149.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/jidabubupurebuboliw.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/26ceaf30854a956f747f2a33461a26c7/ninutemotun.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a5cde2723b55b72dcba5a33d5d8a6c3a/junuzo.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/31660156877.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e4dde969a4574c2449e34e8a279cdb01/49449902831.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/9088655829.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/59312174394.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/komajijekuwimevuwata.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b5fc1b8515fae288a8da9c53e298ed58/71661892965.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/redokakuxuvol.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/56cbf323fe43ad4b219d28699d8ad574/63728850899.pdfIn PDF document text
    • https://dacola.com/upload/files/zomugopulifuzu.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/27113642442.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/94235016756.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/jutijuririwijif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+game+ultimate+spiderman+total+mayhemPDF 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_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 11140 bytes
SHA-256: 080a0618c2936e452754ef0815356f97034872b98c5aa426e109b097ad935682
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 17808 bytes
SHA-256: d1067c8168aa5625a4e526b379d5e38037f95b97b9a82744b320f33588030790