Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a8d0785b67de1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 12:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8114e02af381936aab6325e7a7848144 SHA-1: 2a1f0989999b54a9654001b2e9a4b39d6d932f4f SHA-256: fb2a8d0785b67de1bab8c78c2611dbb557b5f23d6de797e968461e6a95549c6d
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs that point to potentially compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. The presence of multiple unknown URLs associated with compromised CMS uploads strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d66d789f---bopezawimunogubudizig.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9eb8392a---xekugoxokokisudur.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/fububipobubovesatobelip.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/webaratogekunapo.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/64500515403.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/jeraxagonu.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/gamufem.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/walizifisefesazapas.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fa1fbe51c---54416912800.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/50045366205.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/70660880833.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/58ee7911dc292b1eb0fa3020ee8316cb/kiveribunivasuvemevuxi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/44295390683.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/bidisizode.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/vepobavuvupovon.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sb547n3b3qfjjvhqn14psu2ib5/pupuxuxivepika.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/28025610371.pdfIn PDF document text
    • http://caythuocnam.org/images/files/80823547737.pdfIn PDF document text
    • http://land89.com/ckupload/files/29169800018.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/fudowob.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/supegepojizipizesifevem.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/63154121359.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/45792274222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=brass+knuckles+vape+battery+manualPDF 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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 18404 bytes
SHA-256: bd6bbd1ee8678f7fe485fe9aa87ce528285cb6f90b765cfa7370d4ae2350558a
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 10888 bytes
SHA-256: 4b4b042395a6053e570a28451f46c4e9b573a62e00ed0b9589b391c4c9ee8f4d
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.