Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9460f8969cbb41…

MALICIOUS

PDF

102.3 KB Created: 2021-07-17 06:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 21e55a12adb1131cf7769b793d485616 SHA-1: 477919e82697002edbc5b8c4e5ebaad337aefb05 SHA-256: 6e9460f8969cbb417c76c38e59b685b885bbc8567f534cba7b8df6001b037b81
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 0.9682

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://24cvety.ru/upload/files/betiwirumulijanowuvusiwur.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094020a0b67e---sowekij.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/38138786008.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b3e58d11---ranafapinuzepoko.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/61775557148.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/12657785453.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a448dd6d119---99390262685.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/590d159f8ae00adc6c05cb540f7d15d7/41426065180.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/munirozanadazodekux.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/demefosopuzulojan.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kogurororuberobeketagoguw.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/43404484884.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/ripirededogabisawopupanuw.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1b4365b729e5723a317355d56917148f/bafepogari.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tnu4doet8sqvc43k8e120nubf6/28580881900.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gowobamofuxe.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/28318644173.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/mibal.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/97785655095.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/bufebedokolonaweku.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c075c80f---voxilem.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/kifof.pdfIn PDF document text
    • http://valeneighbors.com/userimages/lefojeraletimafe.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/97471076333.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hoe27nvqpvis8go4in3dq2133m/39852382400.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d522b7feae---tonadegifukapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+meat+for+cholentPDF 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_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 19532 bytes
SHA-256: f3a7f7b66c6099720cb3b32ae3d54e2a15d7aa8064dbf29b77cef1c5550d1020
font_01_sfnt_off0001405d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405D 10560 bytes
SHA-256: 3f58bb11d14294cca8a0c929925c11829ba767de51f17d2efa499a9ffb5789ac
font_02_sfnt_off0001584c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584C 17844 bytes
SHA-256: 124db2c00ed8760f462a313703a5765be349a252ae49450ed453156b2a20725c
font_03_sfnt_off00017336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1