Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb4ffcc2ba36d06…

MALICIOUS

PDF

81.2 KB Created: 2021-08-23 12:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb3404b4ab66832a0b15bf7fa94a77f7 SHA-1: 7f2c73f6b784209d3805711f142e7a362cf51076 SHA-256: deb4ffcc2ba36d06c44a89c221435716439f197176022bbd1e25a28e18c0c5fe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to potentially compromised WordPress uploads, strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://jacsonsfurniture.com/userfiles/file/96055237555.pdf In PDF document text
    • http://diegogenna.it/userfiles/files/49682689465.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf20110ce---98890924452.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/luwixevabigatifujora.pdfIn PDF document text
    • http://artside.org/data/temp/file/98951671397.pdfIn PDF document text
    • https://room12shio4.com/contents//files/45822327845.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1d3e4396990a6a06405d87256ae3fbe3/sexuvipumolazokik.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081427050041---mogowiluvikev.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/41416500442.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/vimulovaramulunin.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/dedomogiwexovezujolel.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/jukisexa.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/63569634468.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/2932588621.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d28534d7cc0eac912c11c4d70a9a90a1/pafotoru.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/46977301259.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mimomevoxivazafow.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef09a4da3b---pibukejolupixile.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/78175781756.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/29415405422.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/wewixokebafetalepejo.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/nixopojib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=turning+radius+for+pickup+trucks+with+trailersPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 17008 bytes
SHA-256: 4a29939658f9d0c325829e78903b2fd1c35ce761475fbcb61cbf71f122d1fe87
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 11140 bytes
SHA-256: 88dfd45d4c4a30e0df97ff4c0f37eb52ca7d4aa3b37aeb8646e8ad5fc4fb9a5d
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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