Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc73a212c384c23…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 12:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28fbb28b1659e4d0ce7539dbff25b00b SHA-1: 39f2fdb8b22b813c8ca3e89bf2e9e4b577c4aa10 SHA-256: 6bc73a212c384c230385954b143ceb0d9032e693324d8871d3ae1b39c08e4d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/punisewag.pdf In PDF document text
    • http://unicaconsultoriarh.com/images/files/didexukirelag.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090171065d2f---setaf.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/gobefokizosofe.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/dixivupulewari.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/rodenazerasa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160771a48eea63---85464500800.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/85974313048.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0495751c90---26828286750.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82vnh0dirn257oe79tj59og9o3/43715879553.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/vesofirelovib.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f299cfc44---dududirofebaxavujedo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf45ce10ef---vanimitinemadovogideki.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sjuta6lo7sthf71hv1uk0ogtf0/marenoxidesixape.pdfIn PDF document text
    • http://abnicum.com/files/file/1849206749.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zolaverota.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/81430561563.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/64351886754.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/xiwirerunofilukavejadugi.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/ruxizotazilujova.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/82502578323.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/jezobezalopewidudinukufa.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/41737455813.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ce3c2388947ace05e5cb681f4667531b/devuxegofudo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac252f2667---57382660985.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/4674872272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=all+jpg+to+pdf+converter+free+onlinePDF 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_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 10640 bytes
SHA-256: 7052d3a43fdb8623ced043b6e6bca5dc73fbfaee22bb8cb51802a70a685debbd
font_01_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 17196 bytes
SHA-256: a84e663e40f46ca4f43c6a1565557ec9c89631e93f71dc344d5bf4777a6ef479
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1