Malicious PDF — malware analysis report

Static analysis result for SHA-256 501e76c7a0f18747…

MALICIOUS

PDF

73.0 KB Created: 2021-08-15 23:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bac66d30d64f2a06fcfc630abcfa2fa7 SHA-1: 5dd842fc6be36bed79a91467cd357289478acda3 SHA-256: 501e76c7a0f18747fb907d9594ed61924a24b25434657b5418c3b1e3d53566e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://miaousland.fr/ckfinder/userfiles/files/71451990823.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cec78a756---44552673482.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/jesop.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/vezajojegetefibenip.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/fitajafidiguziwe.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081862616262---juvexipopanafutavera.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/63069792650.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47717245db---13464290099.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/xezexopojuminavuni.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pdc1tc1r5s90mmv613ess7ad62/sotewotodipediwirulerun.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/tafiweworuwube.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/44611226431.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/01a408d952cd159f71395a23ac61bebb/foxosabafuvudumokobafasi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9d75e0dd8b15e38431be55e229fa052/39423346033.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a42a33f5---tuvetalusu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/44329575b6f6f682a6bf565625bb8529/jotepalu.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/rezalusolulijopo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e563d8c769---sejigilaxagusuj.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/25553dc5a80e1fa11046be5d13c89adf/padevolixumutowasamewaz.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1dac00c889---76441803768.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/buxawonejit.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71532154422.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/72fbf44f5a4c125dd7e60e4abf79903f/bikezigodewilop.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6e694483a---24704322139.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jugamakewapugi.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bedazuvijaguruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+ph+scale+worksheet+answersPDF 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_off0000bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 15288 bytes
SHA-256: 080dbe6678a6312e9b3bcea3344221f44a8aca32a8f812c72f97cde513dcb390
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 10520 bytes
SHA-256: 376cdbd267615542c18a7bcdef1ed708f51e517ad64db64161a2348ffe36aa44