Malicious PDF — malware analysis report

Static analysis result for SHA-256 83164dba822ecd42…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 10:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df3ad2bfdf1d6b2270ccb749e3062c16 SHA-1: 728896d59d93de29bed33c21d9d2f9b4f28a2f40 SHA-256: 83164dba822ecd42aa7bf2dff8e9ae30c4e59180a3a972b6b6310b6761db3ace
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using these links to potentially distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=watch+dogs+live+apk PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d93f61c441a8adb3ad3a5ca9bf67ad38/jodagepokotetel.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/53881142752.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/tapikunuwow.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613564f5ca3c0---vawuli.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/84335644063.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b215e4a4---60615733293.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/rameme.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a76d284b---18481467799.pdfIn PDF document text
    • http://etre-belle.su/images/file/xagowedevosotap.pdfIn PDF document text
    • http://tano-cable.com/d/files/67869186973.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109161227098450.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f48a205570---2055988986.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/55173170413.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/febob.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/vivekapefabofoligugasusew.pdfIn PDF document text
    • https://ocw.tw/uploads/files/muwilupugokopadorifexevo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7a9ad126---vunuwol.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/radofojosulubot.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/45085008113.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/60571217620.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/83041460204.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/u01fvdvn5ea42upuaj2f54f2l5/golugikixewid.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/werukezogamuretix.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/nuvulaxepasuxetamax.pdfIn PDF document text
    • https://thehouseproduction.net/file/kegowulotinaxovurep.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/59269705951.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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10740 bytes
SHA-256: d6c06519c28f5262601ce5fbb7ba109cda2e0051ae39c648579b8b60c66a73ee
font_02_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 18796 bytes
SHA-256: 0f657fdbfd6c47afb98e42b0273164106264562afa26ae1ff42848b8744d3be2

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