Malicious PDF — malware analysis report

Static analysis result for SHA-256 865336852a10dd04…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 18:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a2f68faa36d8c337d94fa8ec82972a9 SHA-1: 2bf44cd3902a3965ffe8c0796b4e8f479dfd5db0 SHA-256: 865336852a10dd04e64a81566e5f24f40a41a7975d924d0ea9491b1470cbdffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afded19c8d8---gudedodeb.pdf In PDF document text
    • https://deltarents.com/upload/ckfinder/files/vifaf.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/417223a5a2cd64965ca999de946afd5a/47185720337.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/91324337775.pdfIn PDF document text
    • http://aurora-c.jp/files/files/91815319470.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/17446559470.pdfIn PDF document text
    • https://luminex.pl/upload/file/binezisuv.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/fadarizezisum.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/17939865176.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f811e53ec---rezugob.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b1b1c03171bb1b1149abe67f2ae2667/63148825305.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/lafinosibefatikif.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/21a326bb7b78ec23785a4237067abfbe/7437283081.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/77759858787.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/batidan.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/88650145061.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/fibalufab.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/nurejojejuneke.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/nitademoliwudubu.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/95509536002.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nibunuwilududajumipuz.pdfIn PDF document text
    • http://wawa757.com/uploads/files/30429913342.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fulozemipowasesukasif.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zepusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=oxford+obstetrics+and+gynecology+pdf+free+downloadPDF 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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 11260 bytes
SHA-256: bb100a15aa8bd24f4efeedda6dd81502b9588e688a6b6fae1658a2b89734be0c
font_02_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 17240 bytes
SHA-256: b5a05cac60a3814520cb6ce7e6ad26ddc7a78a4581436cd15cb1c0491135bced

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