Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78c38b419886ef0…

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 22:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9cdea627f216815a972de986998acba SHA-1: 9600a7ac815de4b475d1f7ee05174fa62dcc03a8 SHA-256: b78c38b419886ef07bcc1d114b3ce0f460fe3de0871135fcb1bc99b3f5c8235b
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download' button lure further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f086b5f66---40283319455.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/31651081271.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gezisobexupijebe.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/44819278692.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116c69568f---26172770683.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd427a2dd90---88950698215.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/dasupimosilis.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/77464741193.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/parufakedotisejuwaroti.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/89270555082.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67952d0e1---fitug.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/tugedad.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b650e83e808715479ddf4f3ee91e89b2/gufijugowumim.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/013cfcadc784151fec65b4a2c828d755/kezebozajixovikazuluga.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/04438864b77a1e0c828b62cdf350a3b0/57440044778.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb7a242d---80671250826.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dewefad.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da671e7553---wikosezi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6f940e4e2c7193436cef995db7c7fac0/bagipidujuku.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/jupokur.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98659201266.pdfIn PDF document text
    • http://bscartridge.com/pic/xesulamevotitugusamo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763cfbc3072---lijegalavukenimek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=passive+of+modal+verbs+examplesPDF 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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10764 bytes
SHA-256: cfdff12fe843abef19eea164b9a23e809955814039ca284e4f12a1637dab3bb2
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 18336 bytes
SHA-256: bf42aa31c6cab29c80121b83370b40dd20cea20d12b8d3ff17cf521bdef353b3
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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