Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41e7c4655b4a0de…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 23:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2b2480811ba327d4e8a3e8fd5c657d9 SHA-1: c719721bbf9f07a4eef622d18cb21da8660c9b36 SHA-256: f41e7c4655b4a0de224e16049b46ec602f9901e5c068bebd11ef90578d18a1c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to numerous websites, some hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://matfplayer.com/calisma2/files/uploads/53144224064.pdf In PDF document text
    • http://naszymsladem.pl/upload/file/78972078020.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b36acc72fd0bc44406be5bbf9876f4fa/tiwiripusaxisawaxexab.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/gitonokimulalimukekigesi.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fivozowetomirafilinew.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/unpc8oa7nthprh3g0jgts4q7p2/72436572178.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06943f19f2---zeranesusowojonilir.pdfIn PDF document text
    • http://www.moyekolodin.com/files/28731265717.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/babb31b35b8e2679883f130a31d00079/jusupolugojazumorobene.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e279388a88---nubekagorewilu.pdfIn PDF document text
    • http://riversedgefm.com/files/file/gewulileremevawifuveve.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fcf854e5---jokotodolupunewesaba.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dfec2558bb77d216b163307b399cfad9/60884202808.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/nelogimaxevixamosezunade.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ik4n9s6qgfca9d0qjsrvs6bio0/wibinivutu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b071f428---xeregi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pilerixajesifapovemusojo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7801f4112da33a5fab405daa732f3f71/tinajexakapanaxujesugefok.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/58132371776.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e266ba291d---9727083547.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/wofivejoserujuzavuvalowus.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jusifuxazip.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e501c8912b---voratapuxebesedumunofot.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/65209364389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=modem+sagemcom+cs+50001+manualPDF link annotation
    • 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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 21856 bytes
SHA-256: a96a1d69f3d463d41e6142276b9a849ab1ee24a4110c9cadbac329a9ea645d28
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 10824 bytes
SHA-256: 815fe752abfd7ad38dec26aa3f12fc78a56a5ff9ea2e712700a454d378135af2
font_02_sfnt_off0001344d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1