Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a08cb035eb61fba…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 10:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7ca4f69c622d2e9e4606964ac1dedd01 SHA-1: ae423140e6a350ce2eb58ee83f0f704176e30283 SHA-256: 0a08cb035eb61fba857b6ac5f0d1ea6dede8a7379a5316f6f419d93c3257e0c1
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 upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://inwebjor.ru/uplcv?utm_term=subnautica+game+download+apk PDF link annotation
    • https://groupunsur2.com/contents/files/21127392541.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed2bc48d---namofixuva.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cdcdcefd6---revowemudagox.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/4501862666.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/xipupovefivimubevig.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/78603456124.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/63253290666.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/26739426180.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/mijemuge.pdfIn PDF document text
    • http://anindecor.pl/files/file/78947993929.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/14810113677.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/26073240245.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/pifaxefibuxut.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/vajisinisumejuvekodena.pdfIn PDF document text
    • https://olterus.net/contents/files/gojoxukegesurimomogulad.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wufegupetutadikuxegavof.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/39421172780.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/68246959043.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825b9a4850---momuvokago.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/34615691200.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/rikorasevixinisadita.pdfIn PDF document text
    • https://clubon.top/uploads/files/pejumuk.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/43525133683.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142710cab8e0---59764396560.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/fenimanarapu.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210916060514.pdfIn PDF document text
    • 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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 17576 bytes
SHA-256: 37258a05b11e820cf6a76cb84526b5f40f18b185b2d4107460efbccadabaefb1
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 11080 bytes
SHA-256: e4354f352edf0666dcd1c2e7f3e88f761b91429f143f8e07b0d86b1a3f9d0db0

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