Malicious PDF — malware analysis report

Static analysis result for SHA-256 046ae4c0f20abe94…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 10:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 267e75a17a04dde04c4964ade4541f91 SHA-1: 7a41f3cdf3fb694a7e065013350ea5d1cec6086d SHA-256: 046ae4c0f20abe9404efb8d9872710554c11d213629a2b39e70d5c7fbd33f197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/04ac657f14859f339be8c31759d5187c/60200593462.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/67163194424.pdf
    • http://alanaf.ru/userfiles/files/76583055210.pdf
    • https://livres-arts.com/ckfinder/userfiles/files/65478473574.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4662dfa47dd8ba688c834e491fa4472f/61251856186.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/548918650f8e14730214bedd810a95ae/gakuj.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kekupuzafetupevikif.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/256drv7eiit61mfot6d2ag1hm4/96039407864.pdf
    • http://vejwun.cz/images/wimaluda.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lofexerokezigi.pdf
    • http://seoulsquare.com/userfiles/file/69857988143.pdf
    • https://konyaalotaksi.com/userfiles/file/99239357014.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae8778ef8---pitowitemuzuvebid.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/fojerixamumojakodoxir.pdf
    • http://tcgardening.com/userfiles/file/2021081922174773499.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/brvjos6a1fb02g4lvja7hrl5ui/togutoxavolotake.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/5fd5e66ca946fede21b8e1e3372a4d3e/mosor.pdf
    • http://mkpstroitel.ru/upload/files/fovewogametuteduremeset.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ddnct746h7vnpmgop4t1m0susr/31267577901.pdf
    • http://seabeachthailand.com/UserFiles/file/98216238117.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2408a5ad040953699c3b7e9315af8b1e/11377246852.pdf
    • https://marblobath.com/app/webroot/img/files/21956284132.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=strategic+change+management+models+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d716.bin
bf725ef0c6d5c9a75038276f9326b9a2a86c14cded8ef736b9eb1ac066d20948
pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 11140 bytes
font_01_sfnt_off0000f0a2.bin
a8906d529427ea7d7e90e1dba425c2ec87896cecaa4e9e44884af9f51bddb0bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 16044 bytes
font_02_sfnt_off000119fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 16792 bytes