Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee2188445c93a2f…

MALICIOUS

PDF

108.5 KB Created: 2021-09-17 02:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1f94ffc371c4755286b0f03071d7b56 SHA-1: 75462da23e6f5324108cce99d0cd951c9279aa70 SHA-256: 5ee2188445c93a2fed3701b8a19a5e1d8bf180169898c91375868e46ba27914c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://archism.ru/uplcv?utm_term=constant+mesh+gear
    • https://medius.sk/userfiles/file/nodonedexuj.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/tifapebikopuvub.pdf
    • http://peneleos.pl/userfiles/file/58147854792.pdf
    • http://mispuntossaga.com/campannas/file/tozow.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/fozoge.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/wugijakukiw.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/37386032791.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/44950516594.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc0adafc3---73965590389.pdf
    • http://www.520amis.com/upload/files/52080488111.pdf
    • http://phongkhamthienhoa.vn/images/files/minulapinokogoguwuvoti.pdf
    • https://luckysurface.itweald.com/uploads/files/6137d4346fbe7.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137108e6d507---71459745605.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/boxebeletubotopogu.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161417fa0c18e6---kazukarew.pdf
    • https://dadrarad.ro/userfiles/file/32055482391.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/zovapepuf.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54859bf2f---76944823933.pdf
    • http://rapabzenec.cz/obrazky/files/kilepufuletexi.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a4d91a51---turawatiju.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca650d631---jotewigofolupeteteja.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5600a9e6728e9610b840802f7a5baed2/rusuxawodekito.pdf
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/rurekodarapoxavug.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/ruluva.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_off00014446.bin
b27a90f8acc1852ef0058cec7bb7a7782719b17433a9af5a8ed43df9f01022e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14446 18384 bytes
font_01_sfnt_off000174b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x174B2 16792 bytes
font_02_sfnt_off00018cc9.bin
c0a4ac53c167ba1e40971bb2ceca6842acc8824352f46c0284cc75029f23b6f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC9 10448 bytes