Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdebe229f762407…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 00:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 690f469c85da4ae728d4ff36c54c6bc0 SHA-1: 0003c6a3dbb6f7b7118399225d64c82ae679a0f5 SHA-256: 3cdebe229f7624071e4fdc7ab5f4731227d23fb0f9a5fe299bf99c69dd1db479
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://smidgel.ru/uplcv?utm_term=adw+launcher+2+pro+apk
    • http://wang023spa.com/userfiles/202109file/2021090322325270554.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614a033ce2609---zaviwo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f101lmm6mreijb3il2pss07n76/11210222412.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210923_BCBAE64BCFB817FA.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/da1d832ccddf3442346c762097307d54/25846116354.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/29330358364.pdf
    • http://ntep2008.com/UserFiles/File/zadidimuzule.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e00be3195e5131f0a8f70262e3b07d3b/74174414278.pdf
    • https://itchanoi.vn/uploads/news_file/vokewibemuxomesoxav.pdf
    • https://petek.biz/resimler/files/76235063962.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/nilodarik.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144787288edc---fijaxuzujak.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/jigozexazipozatozafoperun.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cab70911---bimukema.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/60416409470.pdf
    • https://chsins.tw/uploads/files/202109191848124669.pdf
    • http://sport-zavora.cz/data/file/89467720236.pdf
    • http://bayernglobal.de/userVZ/file/fegogel.pdf
    • http://modulobase.com/userfiles/file/62586172438.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/xapijusuwinojuf.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3f6404bec79fb2ed0b456f5e71637403/nobejuzoluludififemiza.pdf
    • http://makinsushi.com/uploads/files/90954665707.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/87053612555.pdf
    • https://vayamcs.com/content_files/files/68040827356.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de36.bin
b11d0fe83853830c405ba715cc55afb260eaf205f5f85e1768cbcf05cfaace56
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 17544 bytes
font_01_sfnt_off00010ba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
font_02_sfnt_off000123bf.bin
cd3120f23f3d183d3f8ca2983160e72146f5a4fa2f352c6181878d505d89adeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 10632 bytes