Malicious PDF — malware analysis report

Static analysis result for SHA-256 410fd041337f9602…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 20:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ef68234b91e95dc3e4689d447fb4b04 SHA-1: b8c7376c77cc54b1ddf6709acd1fd0ded98451b8 SHA-256: 410fd041337f96029cbac9fd591dd6a430a717af1cb3a3127b95f0bafe2cf221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=20+minute+countdown PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160944afc32bd6---rixowokubomije.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fatikujopapunudajero.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93491190415.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/dcc901f854075ae446a6b48fefb60384/nefowazugugalevevig.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e363dc1ed---tebukowexakovefed.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764db2db607---46720847183.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a961c25f061---zozipem.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9afos15e5o8fp85iaoo9nvm4au/baxomibemovijowon.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/watenumagututax.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/83cdc5b33c39056ec3f10274b7ad0e51/pogekilo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bh2nbr5f1vbtv6htt3mdqj4tar/78496554483.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fb570832b596b7294fac63f097ba6fec/gamokububokema.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/46956923563.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e461d2d07---56748720447.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/84503172928.pdfIn PDF document text
    • http://m2m2design.com/userfiles/36701100247.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d99a1fbe9a0c837a16bb126174b280da/fapaj.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/rezotego.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93493853082.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qsa4lq06at84kqtt8jjkr3au54/80021831985.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/96872577832.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba029997---61989129257.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6113c6a336---75544804890.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/nuburevonopifefix.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_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16756 bytes
SHA-256: f8cca39e210bb1bd6d365adf0e7af16e4692852e35a8024637100345b54f6d98
font_01_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 10388 bytes
SHA-256: 7f83b8ea121073b2b9976163cd68013cc8397a187c8b45f8121cee7ce8555763
font_02_sfnt_off0001438e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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