Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef58eb29b9a5a07b…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 01:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a15b7635f6ae903d670f62fea0cf304f SHA-1: 994d129218c0a8e9aa22265e905ce01cfb3ea5d1 SHA-256: ef58eb29b9a5a07b445a2e4a4b66c4be0de1c584f87e7820016d60c05a046acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hicoweld.com/shop/fck_file/file/62799104933.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7e1c85aaeff7b606d40809ab2e0f61b3/tolifutolaj.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/bonabevaduvuzu.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/95248886537.pdfIn PDF document text
    • http://zenkatsu.dk/files/madidix.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/26994500639.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/19050309039.pdfIn PDF document text
    • https://wineart.online/userfiles/file/52480531142.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/78389705283.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161574e5695d66---90086420891.pdfIn PDF document text
    • http://rafaelokazakov.com/file/riduxef.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/bagumuxoz.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/pikogisewobinabig.pdfIn PDF document text
    • https://onlinendttraining.com/files/laguzedefigizudabidajefex.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6b2845ae2290c41c149558867dfc02d7/59569066824.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161404809135cb---58741861064.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/vobuxoxojulukadoka.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/sozoxoja.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/fudezorikisiribuzu.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/vofalofap.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109261853524062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=academe+meaning+in+accountingPDF link annotation
    • 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_off0000b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 16412 bytes
SHA-256: 2a6fdb94aabd40b359e7586a5c4abd7cf03fd74c2d0844d745d82327854911c2
font_02_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10480 bytes
SHA-256: ebb1fa3fa5baa986832610c3daa1c3aee2c95e4a46832b928226852efedb72c8