Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3bd21170724d7a…

MALICIOUS

PDF

133.2 KB Created: 2021-06-29 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 325461fd5a6a099b651f27fbc5315c4b SHA-1: 56368dbc2e2e50fa3badce6a53431f488e364f86 SHA-256: 7a3bd21170724d7aa1809d29d6531864a7c09400e0db1fab3a6c5f87beca73ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to delivering a phishing page or a second-stage payload via JavaScript, although no specific script content was directly extracted. The document's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=perry+mason+case+of+the+singing+skirt PDF link annotation
    • https://muguet.fr/sites/default/files/file/43360080158.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/vimagonoperefeja.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9688711a4---zogizajanabadu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3dfe0474---59870113748.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/92cd256f6534ceda75b922a2fd7d6070/81064603793.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b585be158ce9656330073b060b2f746a/22271994847.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pefamefubugurozizikimur.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3bc08ac0d6328f0411da19f8324e642b/38510871929.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddf956250a680edb5f331d5381c53002/majixuxogolubopopapu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kgq6pjb5l34l55qiel7qnifqi7/lijabogifanib.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/5e63ce627614ac70f458783ce0c46575/xodafejozatusenivemo.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/28666148450.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/50309806845.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/dubowuwejis.pdfIn PDF document text
    • https://bio86.net/fichiers/18799374155.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb385e724---tunikeveduf.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jogetebamixisanazaraw.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/wojodezekabaguxorugupawo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wuxelikalegurogumuzapo.pdfIn PDF document text
    • https://premium-house.uz/images/file/89724318601.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/sotetirejipoluzas.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace594934c---kuvulorusezewodereg.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_off0001a497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCA9 18076 bytes
SHA-256: bebccf870c9e6fc96af1fa0b31b08980f0f8f9d764f5b223f88a006e3757ba5d
font_02_sfnt_off0001ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC47 10944 bytes
SHA-256: 7971c9c8ebae478a79ddc937a4581fd14e0eb8fe381baa1d4c2f6f338cc8869c

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