Malicious PDF — malware analysis report

Static analysis result for SHA-256 25585f528fc7e8a4…

MALICIOUS

PDF

94.0 KB Created: 2021-08-20 22:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 608fb9efa41e8b2f1b185d8c448f1605 SHA-1: 3a83d9f5e46a1020050dde3a0cf97b2a58a90f70 SHA-256: 25585f528fc7e8a4f05770d3cff8940ab6d14e62d2f6e55f8ee7a5c4e04c60e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160711d407c671---gutivativolakuve.pdf In PDF document text
    • https://loctra.net/userfiles/file/95566638520.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea93628bc6---86792650132.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/24069243246.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/xixusesinupojinixamuferid.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/jojapazosu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33162267263.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/85676919018.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107300143400242.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/77884472305.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d169471f9a---25335821641.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/19092646010.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da63c55a7b9---81442923175.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/728b5a8115e13df53109aeffb2b5519a/lepepatonasekoluk.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/sujukipimus.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/pusuwiwunamasabepegi.pdfIn PDF document text
    • https://mahae.hu/files/files/jepatazovixinexuxanoma.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/21188811648.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f67a7fd659c4a3308f0e81321e900d15/94062948713.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160954f57c03ca---6503301073.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/7938737097.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1625640374.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/42acf41d80f6cd87d3984bcf13760cb9/94971312512.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/46ee6976fa400c858bfad54a9083d9bc/95183073957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=why+won%27t+my+me%40walmart+app+workPDF 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_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 17608 bytes
SHA-256: 2ee9685462eb18aa35c2ed457d2138d3b2420a0abcbdf943dee1721f43fdaea1
font_01_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 10892 bytes
SHA-256: ae97c869c9f79216aee13bfd79064cea0ba23959fba2be9d17d71a6620ac36c8
font_02_sfnt_off000151ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1