Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c3bf45e564650a…

MALICIOUS

PDF

90.4 KB Created: 2021-08-11 17:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b51617a44aad0135b52f598815cb5383 SHA-1: 1f2a5dbdce3b200624309df5c07cdcf7ca9190c2 SHA-256: 50c3bf45e564650a7d32769dd8d6b78935eca58f5626bbf4c11cde44f94aa95a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites, often using UTM parameters to track clicks. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=option+alpha+signals+pdf+download PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u596cvgpfnl13g6sv3eok4mut5/difenupilekagapexujofa.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/vugagefumijidizewuni.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/29185910950.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/214740349.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rezugejedekijasoxok.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xuvotala.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d5ab569ecebba7665fee3ef966dfb2c2/88354854847.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/zapupezalumupu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16113455c6bdfa---dazixodapugiv.pdfIn PDF document text
    • https://garnizone.com/userfiles//file/lipuzozamujiverarujedidad.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/245eba5c4469158b65cab4d165ae2f4c/jetelofumuk.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/87029721040.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37be2028b0---visusarigotosapita.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210606203421.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/saxevij.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/96933703049.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4764edb4---jiganujanogifik.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fisubatefutuvujuvamopu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426dd495b5---vepasejikete.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3243be6df---maromegugosugopovidigu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/eaf410715b624d2570fe784011da5b05/nodivemosetubu.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/71661403831.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ce6befd8---vuwepalufumole.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee45fa6158---3084956949.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/kidirajevafe.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9a936c1379a0d51b884998907bb2cbba/jabujuwererupomilifigi.pdfIn PDF document text
    • 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_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 17988 bytes
SHA-256: 546443e46c7bbff18dd9494676039def654b6fe09827d674a767d5fa1d546d96
font_01_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 10656 bytes
SHA-256: 08db8932e5fb1163f7f1959b60cbfa7063574e09b8113b927770eeac1bc655d4

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