Malicious PDF — malware analysis report

Static analysis result for SHA-256 52794d73bf19e988…

MALICIOUS

PDF

89.9 KB Created: 2021-09-11 06:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11f06040e8075fbd7aaf1741b44f19a9 SHA-1: 9b866bdd2356053d6933528f9595bd8d41c6a148 SHA-256: 52794d73bf19e988c2a73b7130fded34251787385a3357cb6264ae57de88ffdd
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' lure and numerous external links, some pointing to other PDF files, indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=gta+5+obb+file+apk+download PDF link annotation
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pixese.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/87473498210.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e35087ec6---tipawasuvojipajula.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/jusobaxigagefelugisagete.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/80932688473.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/64569852131.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/rikamegavetogemimaterilu.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/31880670521.pdfIn PDF document text
    • https://songhong.info/userfiles/file/peluwizudibumojedugan.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/pudom.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/pubeximuroganoja.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6a54c8cdf3694755fa4903a6519a5000/22016982960.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/1350056404.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904120008.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/35985427914.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109110722386163.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01da53d9e---36737622487.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/97330618023.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/pozex.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90649e72f---482781621.pdfIn PDF document text
    • https://777mto.info/contents/files/beniduvinuxukodopo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/7061791966.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/69885172340.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/37693389958.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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 10712 bytes
SHA-256: 903b7f7584283c0967d393aabf2b06f57f5a22af74dc1d65958a77246dc9b298
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 18008 bytes
SHA-256: f76f40c44185eb3aeb98811e52dbd086c82f07b8f9511341a925c3cd90981c2f
font_02_sfnt_off0001419d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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