Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6bb0da06c561bf…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 05:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1f4d6338b5ea83fbdac790b9cf7daf0 SHA-1: 4bb3d8505da62356341ec6fb5a4afc2e9aa0ff31 SHA-256: 4f6bb0da06c561bf7d28e43e670393af73971f89c40d4a34f34ad7c6c766d4e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest the primary goal is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=download+mu+origin+2+apk
    • http://trongtinpc.com/luutru/files/bakupubalipeviwidufatizi.pdf
    • http://ouhkpthaa.org/userfiles/54870032988.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/dapaseda.pdf
    • http://tzsunup.com/upload/mikel.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/glv8apr233omt6sr7o7bmvhra6/99809421287.pdf
    • https://cuacuonbentre.com/upload/files/bofewewana.pdf
    • http://hyunshin.net/userfiles/file/88581904098.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/126a6f2e796d43ded35de70f98b44228/90926521342.pdf
    • http://trevorhannant.com/77946054184.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1dc1d5e6f90eeaa1b9f4c3fec8b684a6/jukixezixodaxireka.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/30597007811.pdf
    • http://dallapietamarchisio.it/userfiles/files/zowevasuwe.pdf
    • http://dintainoodle.com/uploads/files/demux.pdf
    • http://conditum.nl/userfiles/file/wimituxubebuzijawivov.pdf
    • http://moretonassets.net/userfiles/37009525816.pdf
    • http://stagticket.com/fck_upload/file/zepob.pdf
    • http://flairpens.ru/uploads/file/70417626167.pdf
    • https://yodishit.com/uploads/userfiles/file/jetopevebalararikurip.pdf
    • http://etyekilovarda.hu/userfiles/file/mumalusijire.pdf
    • http://rsst77.ru/upload/files/35983012222.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/30756884671.pdf
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/bilunovanurupabifunuviso.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_off0000c633.bin
2b32f0e384e380196199330c2fdb741cba00a72c6ffaf889ac15d02f8b17b4b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC633 18348 bytes
font_01_sfnt_off0000f62a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16792 bytes
font_02_sfnt_off00010e41.bin
07753322c7e774fd53efb54c3fa9b47569f37b5442491f20f746b7741869510c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 10736 bytes

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