Malicious PDF — malware analysis report

Static analysis result for SHA-256 76faef955f667889…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 05:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0219c76949707f059186f7f52521aaaf SHA-1: add42f39915fefc2d5218eb9ea996d4e9dcfde80 SHA-256: 76faef955f667889ca4b2f366c42920b4201c67422eb7d1a710e46a75a46b9fe
156 Risk Score

Malware Insights

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

The file is a PDF document that contains a large number of links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly show the intent to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c0ba9443cbc8a233ecc10d843e7e3acf/10444900895.pdf In PDF document text
    • http://nuitsdartistes.eu/images/file/66529278454.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jikupunofosanofurevadeji.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16150b8e8004a5---45507533769.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/mozigo.pdfIn PDF document text
    • http://pronobile.de/catalog/file/gesilebow.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/43935940373.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/xerejulijimejedikedus.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021092522105773499.pdfIn PDF document text
    • https://granitnet.hu/editor_up/47410140481.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wuwatudolilajafunerav.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/45833623665.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/tugizokuduxuxugesazimu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri6pvh077af5s16l680np05nj1/57894631268.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/sesil.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5aa6d37a0---xufozerekikikarimive.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/79316559421.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/69648890199.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/sudibawovikexezas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+process+media+has+stopped+unexpectedlyPDF 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_off0000af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 11076 bytes
SHA-256: 1b1e64834ac968dfd30d41b4a89b7eb6de480ee4a84a376b48ad4933cd257afc
font_01_sfnt_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 15176 bytes
SHA-256: 983c4b5f81379236acd90a6131cb4aac012169422765109f64c3fafa74dd14f4
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1