Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf09a6f0f89f4c1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 20:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e240d782784f464ab40726cbe7c19eec SHA-1: 79d0308994b7ef7b8a58e53ba9116da3b52f6a5c SHA-256: 2cf09a6f0f89f4c1bf949fbb23d295bf93f9ba7227ae2fcd0538de4e4e554925
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDFs hosted on compromised WordPress sites and disposable domains, indicating a link farm designed to obscure the ultimate malicious destination. ClamAV and ML classifiers confirm the malicious nature of the file, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://educationindiajournal.org/ckfinder/userfiles/files/lukiriwi.pdf In PDF document text
    • http://gibisch.org/files/files/bufadixiwajaxop.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/popaj.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/67872140898.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xifirevad.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/pesasenowegelarekuw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f6549fe7---dowuvijunomupumifis.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad033caad---gifijuxijojejesegerukop.pdfIn PDF document text
    • https://majubesar.net/contents/files/1011083118.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/suxele.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/jutagenedepakugiliximo.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/76157340005.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/gagonusaf.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xozado.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/dibiwuresokizomikunad.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/40568841306.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/tuviloputewujuw.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/1457823469.pdfIn PDF document text
    • https://inarsindbari.org/uploads/fusijunonosev.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1c9920776251c270d099b3ea69649fc8/48400747759.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137516b8994e---kuremarojeri.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/wadojipukasofegezef.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/91532655482.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/pojivejofovuju.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/19791670514.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/25528141641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quran+apk+free+downloadPDF 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 16880 bytes
SHA-256: a44ed6f8a442f41f433a980f67f8af6add8c71444b9bd8c0efa371f7b1e1b136
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 10468 bytes
SHA-256: cf35b6a4bbb7cb6f94354ed1952b097dcd635c78dc85aea65794cb717683d096

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