Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc33d3ec4da0daa0…

MALICIOUS

PDF

98.1 KB Created: 2021-07-23 22:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8f07ce31a4c47b6cd7b5f75b2d4516cb SHA-1: 53fd515996aa9f45a300ee33905ff847808d0b4c SHA-256: bc33d3ec4da0daa0dbf3599cfae6514a4d2f7e07fa682d8b79d0fb4347d3e7f2
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'Download Now' lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttmplus.com/userfiles/files/tupizumedibapajajigu.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mdj8vvdbd0ibb3lv2s6tsuia2m/gipidubiju.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c9392ecef---24225425961.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/noraba.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3982538da6---81852987457.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160977f31aed2f---kodulegetap.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/tisipozam.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fiwilow.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/94955263488.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a9217e698---tediba.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/xaguluposixovalekiven.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607649e0d334c---14251585269.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/tupaxipujasevekomim.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/cl3tebk8pr2c8tvt1g9v1jj12g/3723402968.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/7735071468.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/98766564818.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b2e4cb4f3ead67e4783aa01de351f444/jedifewitedavudeseju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/998976993aef0a5c21d50569da08890f/5069186232.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0aa1fb8596dca8ce92325a9d7b89a108/37783469091.pdfIn PDF document text
    • https://vestol.bg/files/file/bokimow.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/80054478673.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ee204bf86---diwowanefolunijukafiti.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/21425718860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+install+dlc+on+cracked+gta+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fda3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFDA3 17492 bytes
SHA-256: 034b707eff66a7a6eff77328e003a30d7a48c73a203bad04150c6abc6b57f876
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 18008 bytes
SHA-256: 037462619758c7f8ee68b703dd40ff2a7ef599cee65bffaa97751960a8c56b04
font_02_sfnt_off0001470d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F24 10848 bytes
SHA-256: 160e82cc1910b39e68ea98dc6236f5de9702df0579aa91da7b71ece649f6e28e