Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e7b5406d837ea2…

MALICIOUS

PDF

101.6 KB Created: 2021-07-13 22:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf4631cdd9ac3e4ff09cac9408318425 SHA-1: 586ec1ef199b1cd27c6a98ad73ec5efefd66308a SHA-256: a4e7b5406d837ea23e8645b3dbfaec37adaf8a07ecaff8465d574c5c116e94a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files hosted on potentially compromised websites. This behavior is characteristic of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/vutebumufufuvizonobogevu.pdf In PDF document text
    • http://rcp-ranstadt.us/files/92164536879.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qer9p1ocgoahcv8arvgui0i6lh/sonamon.pdfIn PDF document text
    • https://anfauglir.com/images/file/39232849802.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5eacd1142---nukejakituzeze.pdfIn PDF document text
    • http://humanlitech.com/files/files/wuvexoxovivanipoviv.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/72752435517.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f01734d2f---61173710018.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b69261f1ebe---zipanuxixipobe.pdfIn PDF document text
    • http://wajl.net/img/file/202171162858.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/jikulonovijego.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8u0nslsdb33khlk735t3pftcf2/lagizalikipigotafal.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160972bbb5dfd5---rezetomuxebuxujato.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a4eaa6050d308b94365cdb788510109d/tulilijoranuwiziz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6ad04904803d1defbdbd449bf2f1498c/vilevatufometafa.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021051819435266.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gmuv3ba99p11ra61s3marqc804/16006201012.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9kvg62k851q40223idi0ua0319/41538580571.pdfIn PDF document text
    • http://mamitobe.ru/files/file/reputugozabarepuripuf.pdfIn PDF document text
    • http://robedecreateur.com/img/files/87173830740.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503005436184.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7206fc54---teketub.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070155e48d95---24910434697.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/9980512312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=for+one+in+a+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 6336 bytes
SHA-256: c1af59f81bb6d098b7d3aa038b290c64687e0d50c347583c8c7129a2493ac0cc
font_02_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 21300 bytes
SHA-256: c738e8855a0a692f5467d6feda87affee73b432881c6544d562384fc52409a42
font_03_sfnt_off0001703f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1703F 10156 bytes
SHA-256: b34ea04616ba9d3729197cb72623e52b0fba5f2b10a5d5872600e18663b17505

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