Malicious PDF — malware analysis report

Static analysis result for SHA-256 4653516b0a25cc67…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 02:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39e355239bd39a9aa9ac18f8a4c7809d SHA-1: f7afb6447f148c9a4fe713a1e52c17dd7f248e54 SHA-256: 4653516b0a25cc67bac4beeead7bfd80957da805201557094c81558e279fe4b1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and potentially a phishing lure. The presence of multiple links to external sites, some hosted on compromised CMS platforms, suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious intent to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://euro-m.si/web/dokumenti/file/jaragex.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224345cdef---tomuzusutalutozogo.pdf
    • http://salukool.ee/upload/userfiles/file/51780991580.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161432615c7df9---buxitabud.pdf
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/31467558026.pdf
    • https://hinodecoder.com/userfiles/file/xarewipekogudopopoxotawe.pdf
    • https://aramlasmerok.hu/uploads/file/rapopaboxapa.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614700ed96dff---bejajenusuriselatufato.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekenik.pdf
    • https://markyatirim.com/resimler/files/dubunixegozebubof.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7f8ee4d367364eaf747627961fab3ee1/vubopikux.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/baa7884edabf0a2bc30bc0d70ab8b093/tonamipivefesituran.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/zugepigegokepulepo.pdf
    • http://creativetechno.in/userfiles/file/8807217921.pdf
    • https://hosvagyok.hu/userfiles/file/5965152538.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/77880200085.pdf
    • http://szwygs.com/upload/29496025519.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443cec50e4e---38371136515.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/gifiro.pdf
    • http://ghalemdi.com/userfiles/file/nexikorezel.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910052655.pdf
    • https://curewelldiabetes.com/userfiles/file/95389935267.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/logofikamitenoxar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=point+of+sale+system+for+android
    • 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_off0000d2d5.bin
042a261171d8696826a14aa884c86503c54ae414d1452f62efb97bd9b0697052
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 10632 bytes
font_01_sfnt_off0000eb2a.bin
ffdd073937f20f0c8e58e549057935970108e628fbf8e2736bfe4239b47921ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 17240 bytes
font_02_sfnt_off000117d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 16792 bytes