Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67a100283759583…

MALICIOUS

PDF

83.5 KB Created: 2021-08-14 22:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b605639c5f480544b0ca713fac91d43b SHA-1: bc7c99e8375ff75408ebc3b74d0b673ae85e5c45 SHA-256: b67a100283759583efea50e6984b555a443609066266d67d7e5ff054f94340c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, likely serving as a lure to download malware or facilitate phishing attacks. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=x360ce+don+bradman+cricket+17.rar+download PDF link annotation
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8adaffd3781eb17daa51f6bc4262a88a/14200185739.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5db580fc---bukotofezimizeri.pdfIn PDF document text
    • http://consade.com/userfiles/file/vibejuxamevewatoxepamed.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/fenizikelexumasutesava.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de27dbb4b---nelujofagozelojudawifor.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/waxoxevefomidamitebegeseb.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/barolimemo.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/65395488838.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/7141060138.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/nomujazifawusipurifosixiz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ea4560ea---15743590123.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/85674234148.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/naninafugujemilet.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/22053104232.pdfIn PDF document text
    • https://susta.vn/userfiles/file/93035583818.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/maxarenebamuberari.pdfIn PDF document text
    • http://classtool.info/upload/files/63375139353.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f2cf95b61---87907789294.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/89eec786f14687bde61d516789c9b5e3/fizusedovolanomuxajafapes.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/87781932165.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55504852844.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e4339ac457a---10817318419.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bivirumapoxoxedexapexiwal.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 17508 bytes
SHA-256: 42f2cb476d97b334f2c222b93ed125d2f2c0ae5b746a1eaaf52ff8c75824f7b8
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11316 bytes
SHA-256: f548e3d98b9d439289b750717f1db2c6578e09123660c9470e33cec8a1cd6227
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1