Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed340f53fe25445…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 03:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2a593c8226791a70dddbae438a4df84 SHA-1: cde81f5287a997cd457f390ff6a7459be55ce6d9 SHA-256: 9ed340f53fe25445a3a78287a55b2b070e9687c893661336f8d3c38e2b991306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be link farms designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=book+review+example+high+school+pdf PDF link annotation
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/vubokibadivorav.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/xugesotofudixakawudufetob.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/63706890073.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfea01cf112---safuxejogivutavemigi.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uis3nop1v556dgkoh1jveb1duq/76254897019.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tn1onbdko8iigujcunlbo1hgt3/xedotubusunobumulit.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/17907609079.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/j8r07vfitl438ahgvq3qr3obv5/lagamakigadaliluvuzutude.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83747452444.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5g7oncq6dmhq4rlss4u0cci6up/5142499189.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3pa3fgs00nt3tfmiaajgd385v2/luwopikewigoxa.pdfIn PDF document text
    • http://schokozentrale.de/idata/lisonukejir.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6289279607---71787107377.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d9a709c0b---pasalek.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/depijemalewotabopunuduvi.pdfIn PDF document text
    • http://silver1979.com/upload/file/wajagazosariwuza.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/2034181427.pdfIn PDF document text
    • https://kawanmto.net/contents//files/49535859597.pdfIn PDF document text
    • http://mosjob.ru/images/file/3229196399.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/98475511457.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/93993080137.pdfIn PDF document text
    • http://webbuilders.com/files/file/59596975715.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_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 11264 bytes
SHA-256: be6684c6b9286391119217a7a26f9cc76f5a80972bd120a2e8e3bbe9daed94e5
font_01_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 17452 bytes
SHA-256: 51e97e73041586055e455d8faed8cb557b0b96ab7c500a334b1303f2de34a7e6
font_02_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1