Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02dd3799bd89b52…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 04:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c84d5942dcfac53b4b1703c0773b90a SHA-1: d7f83b35e48c98dbf2c0d222751e21f09a0dc4a5 SHA-256: c02dd3799bd89b52294e9b67d48535a5dbd85320bffb46bdd6d5056a9adc63b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://oniceh.ru/uplcv?utm_term=k9+mail+push PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/933e34443a210ab60d74a905094ba314/40370981943.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/lasogifufuk.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40c40fa4b80d323b309a150c60fcb64e/38701849890.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/96467962646.pdfIn PDF document text
    • https://jurad.eu/files/file/77730293690.pdfIn PDF document text
    • http://cutskytools.com/d/files/giviretedog.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/19832066324.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/rudemarone.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/15780993693.pdfIn PDF document text
    • https://novitas.ro/files/3402939762.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wupagosupenusexotaxo.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/88499839711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141471da4bbb---30607355022.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xakule.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/sulanapibixufop.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/dabanaloxuzobatideje.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/18787668379.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/kebewugituv.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/sijub.pdfIn PDF document text
    • https://bnovum.hu/downloads/tibujibele.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/75477505982.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/56592745836.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/gonatobir.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/wozofijarulakitevu.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/78862083667.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/69744504772.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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 18524 bytes
SHA-256: 32e7a963c2326a2bbea73b58c3c9aabd7621c95d088b9eef506981601d6b1a99
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 10224 bytes
SHA-256: 4fa3f8cc38a8d2072bd953eda1b60e87676249351d75ac9aa3ec07b4883f8af7
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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