Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a8f9e94bb03dd1…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 01:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f77976125ede761b76b586ba9402964f SHA-1: 1726e635f07e78fffe6ef6dc6fd40d6ebf8bebea SHA-256: b8a8f9e94bb03dd183c09cf05d074c3a9ec7eea597f73f5c553cee72e64c1717
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the PDF structure and URL findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=word+to+pdf+adobe+converter PDF link annotation
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/nakapojedun.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/zegadixaparokojepapikinel.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/79c550fdcbd1dffc4f0e89a0d4c075b2/guduv.pdfIn PDF document text
    • http://beiks.info/public/file/zofexizitib.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/55261506858.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/45782788329.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbee58233---83453010831.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c535684d450---92354261599.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/mirujevegoziru.pdfIn PDF document text
    • https://ubranni.com/uploader/files/79180643243.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082c24da8d4d---perofa.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/jefogexuxitar.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/1953902317.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/14bf0b62a3a59034d0ee38e2d345e452/rigilogi.pdfIn PDF document text
    • http://araonline.hu/uploads/file/87553417583.pdfIn PDF document text
    • http://amandamaitland.com/images/file/124597589.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/97493106063.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/35098538046.pdfIn PDF document text
    • http://allycatering.com/userfiles/mufuvumuxubavopelidogu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/466a0bee3e8e882d837bdd9f10453ffb/86574326160.pdfIn PDF document text
    • http://aimic.com/userfiles/file/46800646223.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/79624310609.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/874deebba1f2b169d5609d95333409ca/vokexuzatugivizako.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/34104865366.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/sugepidibano.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_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 16988 bytes
SHA-256: 18122eea4ca757e49d2c565b288d8eabd79e4e233c209fe637e5b4ab0e988999
font_02_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10504 bytes
SHA-256: 8b0b357fecf20d0b59a5fc85f622dc1a5d5f2452872c317a348af87b4f1ed738

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