Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30fb1af056e1a4b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 21:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cfa8624a587c50c014bb77aa02853c8 SHA-1: 51c5670a23b55f3400f1d28e900ffd7ca921a890 SHA-256: e30fb1af056e1a4b97bf427e839addd3f8cd45b42dc500bf3c44fdb0ab6fe829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=carol+ann+tomlinson+differentiated+instruction+pdf PDF link annotation
    • http://minhanh.com/files/nujuwenisemijigexite.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/e8cbi6209j976ngtslogkl1se4/jusetijezenu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161479aaac81ad---litamejavaribobitigux.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nipisedojudus.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/sevamazebugofexunufe.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wosipugumus.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/21365847858.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/gomenubidijuxavowuto.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/40974330609.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56585575578.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/xabuposakorax.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fuwijonapotekuxolupi.pdfIn PDF document text
    • https://soechi.net/userfiles/file/revow.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/53495175071.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/18389434550.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/48534773577.pdfIn PDF document text
    • http://ttc-investco.com/img/files/tovivadakizebeduga.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/45863186825.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/timovefuzoxidezudone.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/66256614301.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614186aec917d---zakerafu.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/widowonemeribelamomoti.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/telizugijojejubenajerazal.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161486a534579a---30807937064.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/128411669.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_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 17532 bytes
SHA-256: 7031fc0e32b023081f6c27f2150f4719f300ac275e03ed6d85bb4727b688ad30
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10912 bytes
SHA-256: 7e4d0d27ba3be5a4cee6d9f0e667207dbfe19850a6947ba2ef5a4120b0444c67
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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