Malicious PDF — malware analysis report

Static analysis result for SHA-256 42faafd92c2baab8…

MALICIOUS

PDF

88.1 KB Created: 2021-08-17 20:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e520c0e8ccc465aa9b36c3c435255e6 SHA-1: c2f549849d5d77b2d6d830853ac2bce7eb8c5219 SHA-256: 42faafd92c2baab8d540ff37b20d9906119fdb90f252454f12851d86056085ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ketchas.ru/uplcv?utm_term=how+to+hard+reset+iphone+5s+without+icloud+password PDF link annotation
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/99744fb4ec6641603b11bcd3e5e6e31b/pukitukurofura.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/banurilowibo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd8e4cad2---zeletelukevix.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435514dd60---3556996615.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/pobidujur.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e590efbb3---gakeginosuvufawosatuli.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/josesexewem.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6cf1b66442e58970a3aae47b89fe6715/vazasitowagatolewabap.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f8a7e7955cf87b489b14e9f71991a71b/dasasenawokexobotusuvoda.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/26fd9fd100cf34ce88754c2d16c3d85f/kaneladujuve.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/56483410924.pdfIn PDF document text
    • http://plncse.hu/php_data/file/85412490590.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/47241774196.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c821828f886da4cfadefd0779d292008/temijavinadigubazomave.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4abfcf600112394c84474f15d70a3664/lafimapedurim.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/779465332.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a0acb35e---8469798251.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/51677553218.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6563983be---98860807359.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ae3094b6---wimobemilavajifowigali.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8661f627---fuditino.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7369212267561e48ab69af6e51e6f2c0/15093720708.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7c33b41f---59120908231.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/97291977744.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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 10920 bytes
SHA-256: a8741db596c78cff926509c668af17ae38d6847fa5c1b03cb40a90191ca829c7
font_02_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 17056 bytes
SHA-256: 4a51f1ab54d6c9a91b52af76bc0c3d1decb02fd9ee03bee6d2012de9aecb5b77

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