Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c0b22d66f339b5…

MALICIOUS

PDF

101.3 KB Created: 2021-09-04 19:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0ebed9d417250d90f2c96b915dcc381 SHA-1: c78960879827614e8bb907e5f0f650ce30612e45 SHA-256: 80c0b22d66f339b52557d3259c6f14116069380102b4357454359c1a6bbd0c01
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=grief+worksheets+adults', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://wastran.ru/uplcv?utm_term=grief+worksheets+adults PDF link annotation
    • https://anmoul.com/userfiles/file/27906845888.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wulerixagebulij.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/sojaxofarub.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jegekitilokewepujazod.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11c8c408f---sefuwobalopeliv.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_023512.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xafamajasewifabubekipezak.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/bujidolekopenifozozozawoz.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/dinojikebelep.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/59310054455.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/52506471760.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c85ce9f2---44981202107.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a4042be3---vobotixukebi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/4919368066.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/54690373680.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d75b19a9---sovuwoturawewirusulusumil.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/binikisalutemu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tujub.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/64486996550.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202164101731.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59288854284.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/zemegopog.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/74232913668.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/71267433834.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4289a7b56---78798786450.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5c0cd2635ecc8d46611e393ab2f0c82/19215238798.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/52e1231c8f9b10a9e3102b4f5d3c9d2c/pakukitefibunod.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_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10664 bytes
SHA-256: 8ec0648d4a31a59b368bf99c43d531e4f58134fe81ac28c3aefe6c2155a98b5f
font_01_sfnt_off00013e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 18800 bytes
SHA-256: 4366377b1a3134adb21639ebc9e7a7e013efc54eac2d42b016f824b3834efeec

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