Malicious PDF — malware analysis report

Static analysis result for SHA-256 63521259b5319066…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 15:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1426f1fdcffbf5d439cc077858975632 SHA-1: 501769cb8d3ff512d57e053814427283b2884e47 SHA-256: 63521259b5319066f2cb94e52152ae1d3d746418858b3554923b2a6d0d112cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm attack. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=comparing+present+simple+and+present+continuous+worksheets PDF link annotation
    • https://suruburi.net/mm/file/85820472786.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa3342a262---bexiwovoviwi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/soraz.pdfIn PDF document text
    • http://packamate.com/userfiles/radagiruzudeboxo.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/78541948664.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e0694acb6aa---wetikibuvuxubuzupuf.pdfIn PDF document text
    • http://nfc.soo.jp/file/lufovegimobejuwuro.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164b1d1b46---16236225703.pdfIn PDF document text
    • http://coumert.com/images/file/40814201777.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/jowilurapuzalefozezoka.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/34601845624.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/58735309832.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ba84897f57e520841d9a9b21539bc63/84558633783.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/2476407710.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/toghbekijfv6420r0mp4l8bone/46888366289.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/s6mt077hsmvr1ai1f1gpevodkt/bigag.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/zefifutijozuwakufomesu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9ea3931da---vowurebevudowifesiwopijuv.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wivuxodupawokov.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/betuwodagol.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/sunodibovotokotorupuluf.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c1d8faf7---75273075450.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3511b208---50043794990.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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 18748 bytes
SHA-256: 49f0857d59e64ed4db9807db4273bf790b932d1c837a38a6d02b0eef97a583fc
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 11268 bytes
SHA-256: 1b616a4b02f17ed2abd3c9f50edefc5b01267834d8c877e3af4c049e3f2dff83
font_02_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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