Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f573b9b80a2b451…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 16:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 010ff4bd04e7005b6648aff1a02de7b8 SHA-1: 99475595b0ea7076d89f033187fdb7521bf20fcc SHA-256: 4f573b9b80a2b45168e4cb39b98ef1225cb4f0684bec59e84b3ec32364c83710
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary goal appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8bb84abc1c77dc4a2806422b2eefbf18/balavemogusekopab.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c652acc1e4d725cd115029cbf5bd712e/43845367565.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/43113682461.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/58175033894.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/6851154655.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940305c94c3---7722672679.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/rekukatanoroziru.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/26594573476.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/24b7ba72445ae9ea1752f7d8b9bc70d9/28462909418.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/79141819453.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/90393985691.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/jatovasowosaj.pdfIn PDF document text
    • http://unsersohn.ch/images/file/92499510563.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5noofn7s83k93uk2iq640lrssh/31399332451.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/29337794579.pdfIn PDF document text
    • http://innotack.com/userfiles/files/dafezugojupabonujuxot.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a89203f1ed6d65e09aa7ae985e86ca53/77479633677.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a44d312c6---fuxibukatejapubilefunidep.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79ef2e681---96740416062.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/df68fo5bsbhhmr4qs7d0m3tnp5/81753107966.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/78749831218.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/54875191242.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860dfd09821---95275063351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=male+dragon+names+and+meaningsPDF 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_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10488 bytes
SHA-256: 89286146f63e88756015ae69b2b4f44e99f69eb66754e2208feff15394909a3d
font_01_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 17340 bytes
SHA-256: 36f0e18837a9130624911e0b629dbb38f2d116781a661d48a91083c12cffeeac

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