Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b64802fd4db1f74…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 06:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbdd1164f473c00489d3ef270acb5987 SHA-1: 08a28e28d157e96e149dd6a6798b0e5aace6be37 SHA-256: 8b64802fd4db1f741a2e93d057dea2fed6823a811f7c3147c51d814ad8e3d8c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'uplcv' URLs indicate a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file.

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://allytemp.ru/uplcv?utm_term=pubg+mobile+silver+coins+hack PDF link annotation
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411d429c792---vimuxizibo.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/77067349874.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/lenineditalaniwega.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109032219038212.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909191110.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/51932907013.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/60248698398.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/1702695511.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141144727b32---mikaxizujaj.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/24743694325.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/96805689509.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/bagezibunorune.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/90050315540.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/83660505804.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109120235013899.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k9fabk1823m84m4s7rg47ios27/35365363596.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306a8805481---fojidijobojususujinebi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/siwonaxajulajewor.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9278258f2947c6dbf90d7a1393f00d61/72672840068.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/bamezajowobinezokimuda.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141379f71998---vipimirulopojar.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/13572701963.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 18172 bytes
SHA-256: a800bd65ef32fe17a1489b957278901704f026ebb32ce365b0c8b3f447dfbbfa
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 10976 bytes
SHA-256: 1d633002295c03baf00a763fffe4bcad24dcda8afd07ccb5cbf2f6801c258e25

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