Malicious PDF — malware analysis report

Static analysis result for SHA-256 253b197b275e5376…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 17:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9df43c4035edc74fd379463a78bcd348 SHA-1: 620bb16b1ef1bda6dae57e0bed5d5f591038abaa SHA-256: 253b197b275e53767c036196a1c4246cfd067ffc7413418458bbb47d590a124f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious content. The presence of embedded URLs, even if some are benign, supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://psychologyforeverybody.com/ckfinder/userfiles/files/damurimonepurewobi.pdf In PDF document text
    • http://elesi.eu/fichiers/files/zujitimevi.pdfIn PDF document text
    • https://betsin.org/userfiles/files/wezodufola.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1865f53b---mijedasij.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/23652566408.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/ketuwilamej.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9432ce895---56027181739.pdfIn PDF document text
    • http://orem.mn/uploads/files/ditobopilelaf.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/40719111422.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/likifaribavam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/03oi696080um2o9eh8ri20vot9/82431017668.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/96079166619.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/37851840177.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/melororerilori.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bozif.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/42402779511.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/63270417066.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/vuluzigifodebagatiwone.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/jexowugosajawujeka.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f583491d71---roxetipapuzuni.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/77690334604.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mugozoxujumedukurasidaf.pdfIn PDF document text
    • http://surausa.com/uploads/files/sinitabapedobu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/momerakapopesurasovud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pir+e+kamil+pdf+englishPDF 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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10820 bytes
SHA-256: 27fd2821c6108194b5b7dac4ea5fa67d709fc658a08e7861d0668a68334f67b6
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 20964 bytes
SHA-256: c38ed82cae5cc19519b62df1e6d33fd70ee8f04f9755c69780856d2815e40789
font_02_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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