Malicious PDF — malware analysis report

Static analysis result for SHA-256 973d4e563b750558…

MALICIOUS

PDF

89.8 KB Created: 2021-07-29 18:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73b2f57706a8ebf3af65749e7c02b4cf SHA-1: 710da8c6c44b7898eda4363fb36e16b020726776 SHA-256: 973d4e563b750558419760c17ccf38f9abf84ee513f195bf9f1b969b04665bd9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites hosting further PDF files, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d2c8f4cf29f60e5ab224121a91bf89c4/ralopuvoribugegamipale.pdf In PDF document text
    • http://hajni.pl/userfiles/file/dasosozobagadake.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084241ed57c5---felunajupixudilo.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/lumenusejiti.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/31599626937.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f0056b83---kopobosojilusenasogofuf.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/2593191660.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/997fee1fa8451082bba3efe75c23de84/galitajiliregewokewuxeli.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/eqb46cau8d95je1vh4a8145s7p/gamibidozoduneb.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/lelifuvuve.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/93725787834.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/9191541229.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a403d8a115f---boxatirimupose.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/goduseguvagesekaju.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085995478f07---48831816856.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/90969301470.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609981f8bc10e---lilupegoxebifakosoten.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210610121821_tnxkg2.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/71148464291.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/g73bbsdkpbhnom255hbco0n65c/41164601995.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/28905201990.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/lenovuja.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/66372951760.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xosedatap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=black+desert+mobile+grind+spotsPDF 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_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 11140 bytes
SHA-256: 287707de9598b474a1eef689327071ae47f4fc46673b96135e8404d97b29479a
font_01_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 18760 bytes
SHA-256: cdc2daf85ff2a4ae15f1a3ee650f74ac2af5c39c950598502602ef6566b017ed