Malicious PDF — malware analysis report

Static analysis result for SHA-256 398e392bc04b0ddf…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 11:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 33f71ec9f8d46a7884c94ba7924164b1 SHA-1: 99a22ce6e2e4602d69da26a814e88af3e10a73f3 SHA-256: 398e392bc04b0ddf0e7293d51f05cf5d77ebeabeeffdaba204f12c4c54539900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to files hosted on compromised CMS uploads (e.g., WordPress, Formcraft). The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tcgardening.com/userfiles/file/2021090413492973499.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/kubetegolojapabepasimibej.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/nizino.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t37h0vhe25b204uu340vjgku60/47132106087.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/lazodad.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/xovebepigopolavixug.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613187923c282---64809221988.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/59303527849.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/mamavugiw.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/sojoduzenexofetag.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/93665135484.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/suvoxoredez.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/84463853829.pdfIn PDF document text
    • https://rinducm1.com/contents/files/54195709847.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/6924649645.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/92140730810.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/42019043313.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/lesopejalivarel.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/96488787936.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xujuxedekomi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee73c852be---filetijizuvo.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/jujuxupovononibunekera.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/42945455692.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/83304891340.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/42706998504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ghd+sports+app+android+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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 16772 bytes
SHA-256: de2df89c7abfeaee02210749e4d816d33f90119fc0aef4a6889918e437715a97
font_01_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 10480 bytes
SHA-256: 71c90e0971a8daff2436121eb03fe42b89f5395e16b25b6f20840c89cf41462b
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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