Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52190d336238f1d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 773c993c9eefd30a0a1322d1741c4c83 SHA-1: 834fb5745d21ec3be6f668e76f0f771c03b7e31c SHA-256: d52190d336238f1daac1b7ab6f66090afb2050c09e9b2d2f00e6d32fbddc7247
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links to unknown or suspicious domains suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://qlionshousing.ca/userfiles/file/letavolikeva.pdf In PDF document text
    • http://opusincertum.it/userfiles/files/kexakowujurebux.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/52133305108.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/43848b6a4e7b62189ec34c975d6bec9b/nanupapovufurigefasabejo.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/46157635222.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/63925837754.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/49624891629.pdfIn PDF document text
    • https://manenshop.com/upload/files/panuzugefi.pdfIn PDF document text
    • https://led7.ru/file/1003405686.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j573hhild3vb3uc9bftrk8emq2/wifelidatuwevogogon.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987d91da82---xepukosasatudazilirunoje.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/35263213716.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/tudufisomezikelekelato.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/foravekosexu.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/46286718342.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/bojajixaxi.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/deduxaxixusimunakil.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870d7a121a---jovumukonabesududuwela.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396deb38897---9469033014.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6924e92---27211258562.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/xibape.pdfIn PDF document text
    • http://sql110.com/pic/zemigevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cast+tab+chrome+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/79411194975.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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 10760 bytes
SHA-256: 6f39997da7806e2bf05db8d8c5bac6f94027335ea2d17a2642879b18cf7e39bd
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 18620 bytes
SHA-256: 78608740d46a864a318c88826b9994b26667ef762a8fab6818fc66f46ae1f2b9

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