Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a40139bddc2fdb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 07:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1d218e47ec80491731cf7f14f7abbcb SHA-1: ad5ec8b7530d88fe69f5c1975edfc007a98fa2a5 SHA-256: d5a40139bddc2fdb15867b560f43d1b2b1fa5684281c4259ec92ed7ebb5afef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://penmypoem.com/new/admin/uploadfiles/file/titevixojuxiwevokuw.pdf
    • http://metalzilemboeventi.com/userfiles/files/tanixe.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/minaxopenovesodumum.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/77343720834.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/baf20e0756d362dd56906862e2c4e53a/26656608670.pdf
    • http://hongdanhaudio.com/luutru/files/37770495058.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/afeae69b93dcebc73de3e9933377b615/41477405817.pdf
    • https://agentcctv.com/userfiles/file/vilogovefijogaxotogibu.pdf
    • https://activepymes.com/pub/file/34151062169.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/398723c56433b17d62e35ca3e6cfde7e/91530997623.pdf
    • http://giasuthanhdat.vn/Images_upload/files/folerunajajamuvaxefovo.pdf
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nasaxewopalitetomedex.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/zupogam.pdf
    • http://itena.si/uporabnik/file/fuwolom.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/87093416120.pdf
    • http://gzcil.com/uploadfile/files/mimisapujilezafoteteloko.pdf
    • https://careerroots.net/ckfinder/userfiles/files/36136805124.pdf
    • http://jonkmp.nl/img/cms/file/13845756093.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/95820527129.pdf
    • http://amoy-art.com/Upload/file/zobugasulukozenan.pdf
    • https://arab-hams.com/Ups/files/37704337987.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94635a94e---zaxasumijovekaj.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/85363167958.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/28894634502.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lock+screen+not+working+android
    • 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_off0000db53.bin
a7b8f92970706f9a700c21e7770d75961d4c2d7e6e39883a34b170fa2d213e29
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 17960 bytes
font_01_sfnt_off00010925.bin
8c03279b1f152632c2c72b4620e00da39c2267d1dea5dfbe3eae756fd1bf8d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 10636 bytes
font_02_sfnt_off00012181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes