Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3367701219809ed…

MALICIOUS

PDF

95.1 KB Created: 2021-09-18 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce74ca190b6c477743f2a7a82b0e1fd4 SHA-1: 64f969aa2c61d8a6e84d3fd453b9bae5ca507d93 SHA-256: f3367701219809edb8bb0080c8ac4d321444c7225253647befe1817e4d790ae3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The presence of multiple distinct hosts and UTM parameters suggests an attempt to distribute phishing lures or malware through SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=nvidia+emulator+for+android PDF link annotation
    • https://renewone.de/files/pefut.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/41206740029.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/74298138388.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/37954565239.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/34879560378.pdfIn PDF document text
    • http://deforma.it/userfiles/files/taleselod.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5273bc6ea47b47a44541806a745aa377/golavofi.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/porozisezasiwatafeka.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/simotutepapu.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/katerikibu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b8hfmua08hub4n83eachjk6o41/vibapifuwukoga.pdfIn PDF document text
    • http://dentali.cz/files/files/ronaj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140849d0a6e8---jipegafupomamawifuvumofa.pdfIn PDF document text
    • https://lorus.rs/files/xubid.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/75730079254.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801484273499.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/71433792112.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/65922856536.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901095250673453.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/9424440004.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/55ea9c8de52f49e656f7b5cabd3d68a9/gugexopimoteruvidopi.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/tezowixolowuwoja.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/32631443925.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0b4be3e---8303829873.pdfIn PDF document text
    • https://ayurmitra.com/files/file/48658394909.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_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 19032 bytes
SHA-256: 851b738264905f72165eb9123a2a7f3a14f5d50a415ad9cfa902b67b3066adc2
font_01_sfnt_off00013ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE5 10492 bytes
SHA-256: 76eb5e7cf62aab96d197846c5118194503339f11688dea69e00ed035c04893e9
font_02_sfnt_off000156b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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