Malicious PDF — malware analysis report

Static analysis result for SHA-256 14df5fad18ced2c3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 14:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db1e1256b91fda70fd349617ad1e165d SHA-1: 7f5cba79e8c9d4366354d547ab5089107cc71fba SHA-256: 14df5fad18ced2c34d5cdf3cc333bff4476972d79c008787f8511c71ed0454e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://otoozevran.com/resimler/files/31389872894.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7d7ccb62755cccdaba75011dac509845/dufuzoguvo.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/nojaberafiku.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/78d1a7bdb5ad088243a7c27af7b697ab/66493807938.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4baa26da---zejebo.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/68170604911.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/62712371363.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612184fae934b---66872221912.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/37046678311.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/korawirilapal.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/sufinekevokuz.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76714236c---rusolanemenogaxixexu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52f74701b---64372618895.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/pexotaxifasetelig.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sr22c4ch1dgcg4ghs09riiop8v/49915118225.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/13052913332.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/bosoj.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dovufunuguxivakudug.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fe6462a8c0e216e4a0f026a3c123d843/puxalexirutiwizoxuvibi.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/vofakasobanorurivivoxera.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/foxezifevojonano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=anker+soundcore+bluetooth+headphones+manualPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 18840 bytes
SHA-256: 4475ce6e679480c66b5b5e8dc1db2585b0518bc550566f237a23094f21413546
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 11000 bytes
SHA-256: 3bb1972fbeed7453d622b1790a71dc1e5b0a5de993279c44134cff82811b38d9

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