Malicious PDF — malware analysis report

Static analysis result for SHA-256 195225fe2433b6d3…

MALICIOUS

PDF

89.3 KB Created: 2021-06-29 14:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6070930ef4c1208d68b285445cda541 SHA-1: 4004eb56a1ba04222760ae9b2455ad13e7ec0852 SHA-256: 195225fe2433b6d3daf1573437f0bc1409d0a969c1bac223a96948b658220981
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

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://queure.ru/uplcv?utm_term=almost+as+though PDF link annotation
    • https://amursvoidom.ru/media/files/60650018535.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eddd1782f4---xafamemuzonuzisodivakosa.pdfIn PDF document text
    • https://peterdegendt.be/file/32108583353.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160715452b1f9f---17623684575.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nupidinekaxeroxeg.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a863e557a163dd3c111d0334dbab8d6e/pazebomadajoza.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdd10eae0---petivapa.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///36224464117.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/23102b1b39009439bedfc36a9b4c5b9a/35331106764.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84cdc2ad4---27972067469.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/82357747187.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bf9e915b---zekopapuwazataxizu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/40948693560.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/85657238579.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/rozerebelabom.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e1e0f46a533186954d560ee41ff687cb/41989759059.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/mifusexivowidobeme.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/nalemukisapixifavises.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/kitukowogeve.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/ziwabigewotu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18f7133e1---kagejoxogabixowi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887fdf7591f---fumugawajasenusiwiwor.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d81551ef93---15363995241.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc7cf025e---42115706412.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kifega.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_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 18684 bytes
SHA-256: cdcaff47eda18aa87f298f4f45c0034c317d855051b67d6ab67903ef3fa269d1
font_01_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 10208 bytes
SHA-256: bd0e184a67f4c935d118988698dd62f6cd4eaa88244cb85b6432603084cad52b
font_02_sfnt_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1