Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2ac4fcb99d92b5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 23:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 958f98707427d2342070c9e3522a7286 SHA-1: 568473a1cf22b33d441b3582b6f05584930bc81e SHA-256: 4e2ac4fcb99d92b5e810a98ca3e103a8ec46a246adabbd0371be73d0944b96ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=mi+wifi+se+desconecta+a+cada+rato+android PDF link annotation
    • http://cameradungphat.com/uploads/files/60183756329.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/kubawagasanogomilixebo.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/vekadadolumuloja.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/17474609760.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/salugosuzitevotijidolun.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b41612c89.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jikojuvetijogalujebano.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/todojuwuma.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/ladimu.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/8017801516.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161424d614d0ed---mavegor.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/viride.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab868a3b03---45988834872.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/92291663251.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/fugigefurifepive.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336ecb3c11a---19943665186.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/berefixukonib.pdfIn PDF document text
    • http://savemaxint.com/files/file/77102906556.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/5109942188.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109091749228950.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_152713.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/gepere.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b2892809---dupatozabosuzel.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f45391abb---34180011092.pdfIn PDF document text
    • 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 18084 bytes
SHA-256: 51f1cf4ffaa66c6877029d074ac0c47f5d416e031452027c3101d903feb19ca8
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 10500 bytes
SHA-256: fe31635d518003ce508da31e17b7cb70e8cb29b071cc2b0c2b0ae6cdaf797331

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