Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e85674089d40284…

MALICIOUS

PDF

91.4 KB Created: 2021-08-14 20:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6ef31b84d59e2858f276baebb01680d SHA-1: 7ef1011255c910a8f56c144a6ca1af319a0cf15a SHA-256: 9e85674089d40284c878b91b85effea68c355f228a74f36c4f08dc82b39325a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress upload storage locations and disposable hosting sites, disguised as a Crystal Reports download. While no scripts were explicitly extracted, the nature of the links and the ML detection suggest it is designed to exploit users or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lacecinella.com/writable/public/userfiles/file/24116747227.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dea5dcf7f---gigozitopi.pdfIn PDF document text
    • https://kar360.com/resimler/files/xudezobujononavonugenated.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9df90275d3fd04fe2fd2dbf2462d9f0d/28868939910.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9obsppqcov9j356sf4calvmvhd/demar.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/96340199123.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195447363b---65585055490.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5b7hgrr3s8qinjcor80tgee336/96901735738.pdfIn PDF document text
    • https://egf.tw/test2/images/file/305978787.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2c4a03fb---41117289021.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f80b9118---busoja.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1d2ada68d678a181e1d5a30363223ee9/voxibig.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7c7a481351226e791527860d7b5d7d5a/57451027730.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zolavowowofisato.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/wutuzebejovupajitojalo.pdfIn PDF document text
    • http://centronegozi.com/public/murokux.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5396e264425e31d3ab17e70313aaa0e3/46140096682.pdfIn PDF document text
    • http://henca.com/files/details/file/wiwepukisoj.pdfIn PDF document text
    • https://bdata.vn/upload/files/16436591493.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/jagobu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/zapapugululit.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90fc17dfe---66268310023.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d0e9ad748---wonasulopojufikokuvojikem.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/33801727770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=crystal+report+13.0.24+downloadPDF 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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 18428 bytes
SHA-256: 4a09663e08bcecba1d6f87e5d4550b1575a1d159eb82e69342a706c63e4542cb
font_01_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AF 11132 bytes
SHA-256: b99cdb22106a42439e4e1b65c934104968e127a95e9b56f4d902b9b9d1a07986