Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a65f5a0dbf3e0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 04:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a62a8f733a5af15ed67feb6daf60114c SHA-1: 3a2fc073ec643f798f2cc3db995fb6844437667e SHA-256: 5f9a65f5a0dbf3e08f1482558a7f6e7725c363c7a6c1c1bb58e1bcb7ad0729c8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=ps4+pro+for+android PDF link annotation
    • https://fokusmedia.com/images/uploads/tolawirisavidawipovasuk.pdfIn PDF document text
    • https://mollis.rs/files/kumavomafogikezoxefe.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lifoxikuwavidufasef.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/70398786358.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/sitevumarakoles.pdfIn PDF document text
    • http://prmakeup.com/Image/files/96028713722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139af5cbbdc4---61249693829.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/wetobegelaf.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/seluwewukusomimezoluti.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/58187552206.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/bawir.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87dc92a70---36410671245.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/8894420547.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f43dc8277---32472162650.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/motoxafarixuvuramezoxub.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/4969173580.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/82996477994.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/44429324762.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/72850333463.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/felikifixuparoluditivop.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/xeburuzobubefawagivar.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/58185656301.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lodiwifig.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/97484132380.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/32179378929.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/luwuno.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10292 bytes
SHA-256: cf08235ee493a267c4ca094045a43724a6c26609179e3a5e9723081bd0c533e4
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 17280 bytes
SHA-256: ac64cc1133bf7e53d7faf0a494d1613ee0514a721f4bea4d7d3dad65f884cd24

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