Malicious PDF — malware analysis report

Static analysis result for SHA-256 541ea686f01929f5…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 15:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2746567512dffc0bd2ae501f2e3d6c6d SHA-1: e6c0adbcdce472edb25d897d71a6c552e6279add SHA-256: 541ea686f01929f553526513d0817f0410f4e8f57dccd0e69e5af1b93d95c17a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential SEO-based distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/35a09eabcc81e7b6733160c80b132b42/37545100445.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/5905842067.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pgcli8ggl0ni7nav188o2q54h9/juzifirepapokodiwofil.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/todil.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9ssvfbcpmtjaq9comq7svvgjd4/febiwomugewo.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/zisugubujovakolub.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609297a7d3d56---wipez.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0aa1884f873c8f7e31a890e67f0f3ecd/ludiwesapanovagatugebu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/25155938158.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f0042aac---21932488626.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/550be2e58f4c3ff0a7135bcc8c41c02b/fivofopinawijubak.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/vigetabopesu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/89518036194.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9bb92ebd1400f3df562021b412ecd940/57618455195.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9c156fd6c7aa0128e8466707d4e92a7f/ninoxinogelurekezasipete.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9baa7bc9a5f4fb19b0e6e9309ee6cc4b/bafewopofapozatixodebid.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ri8anp230dddfq1knjeteh6bu3/puraduferi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c763c0290---tadawugeleda.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/405da5906f1e59bd3bb3e7746f27b74d/tatepogudovazugajijefutiz.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c5d836erm58u7dfbmifno9laa4/pipej.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/fubedupofupek.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a0dde702---44547079027.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/14433010972.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/56964170756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=explain+the+relationship+between+scarcity+choice+and+opportunity+costPDF 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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 17168 bytes
SHA-256: cdb9b77e7a9bcf12edf3490ff8842a8666b89e372a78b359823f639e1f712898
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 11136 bytes
SHA-256: 74f2e8f205716aacd3cd93586a2c81cc28df6c5a0fa9d9babbd4bd770270f188
font_02_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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