Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f6379f3d4a04ba…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 07:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4341aa38c41d1373e8e9c66a573d6356 SHA-1: a4f7416223a298cd2933c97fc55913ecbc1e2698 SHA-256: d1f6379f3d4a04baf9df21bf15eecec7beda9c6234076545d5c4d1334d5f99d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://drafthe.ru/uplcv?utm_term=share+exchange+calendar+with+icloud PDF link annotation
    • https://bosingels.nl/ckfinder/userfiles/files/44435803422.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/makotogifa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9e1ecb5e---kiverojapenufazororepa.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/25f4c8523ffcd7e028eefb1e4c4fd063/5267820927.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/40710542501.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/fopalufowekob.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72d05a519b---kukije.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/remobiwibirajove.pdfIn PDF document text
    • http://status.cz/UserFiles/File/62930998991.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nlhc7cm6smd12edvd5jcqmeul5/27829585872.pdfIn PDF document text
    • http://kco.su/userfiles/file/78308236789.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gatemawixowarumujaxev.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/foxavuzijituzuripogakiva.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e3d853dea1168a38b7557b10e08533c7/zawakedanel.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/53399522284.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/kugowuwawa.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80463152746.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/972blct2s2jgd37kms6pebrp5d/pusojijowafebavomutamuf.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f54f1c05---1518072400.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/12322053039.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/xexigevawazazelen.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/86391420290.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tukopetuwokita.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/36cbecddb284ea9f53183da28ec5a0b2/12165440842.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10844 bytes
SHA-256: 03883538184cd56a966780bbb4d7f4eb964d86995b1309169e02fe41295b7326
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 17828 bytes
SHA-256: cb4e230fd3399e52780503aa5f597912cdeb4f51a347370d6a66a3098368384d
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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