Malicious PDF — malware analysis report

Static analysis result for SHA-256 db93890c46fd409f…

MALICIOUS

PDF

88.9 KB Created: 2021-09-09 04:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ab4c79942f809d2906d91811a84fd772 SHA-1: 8b400167e9fe33f44a39c657a2653206116264ec SHA-256: db93890c46fd409f48432582b3824e3cf89c8358735ddafaf4869197c3d9f90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://consurs.ro/ckfinder/userfiles/files/35567544305.pdf In PDF document text
    • http://inwallendorf.de/userfiles/file/86880146573.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041555432586.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/munatalularazuwewovu.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vulefekib.pdfIn PDF document text
    • http://seamacros.com/upload/file/ketenut.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/51269799665.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613276ae86f3c---woguben.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/25626688681.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/21675523107.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zidesogakexowadunusi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138869924a26---nipokulotenunakarav.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210906_DCE7F45EFC5C3C47.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/91231533614.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/61775714060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e4eedb12---53315199860.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137088189537---1915737637.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/xojopuferiwofoj.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/18952220385.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/74988572055.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/vejemavubujozidanipufoku.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/58500244194.pdfIn PDF document text
    • http://taxfreepoint.com/file/87900255488.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/45328878286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=table+no+21+full+movie+watch+online+gomoviesPDF 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_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 11212 bytes
SHA-256: 467a32b88700dd02288e0e88aae3e416cd60a821ba583323cb4ffc5aab8fc4c1
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 17596 bytes
SHA-256: 00b4ef71ee11dbdca2e8337d1e573261634644800af5e826d9f84769606d5f40