Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8e9e4fa2ff8747…

MALICIOUS

PDF

71.8 KB Created: 2021-08-28 09:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 820bbb60d428a99479877e10e7f57c78 SHA-1: 4999f68d051ba8412a4d465e8616d852cfd7c2d7 SHA-256: ec8e9e4fa2ff8747eea9ba54d3f73002c88511ba6668df43e226eecc7ee6b0f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns suggest it's used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://rustproofingottawa.com/userfiles/file/76330182482.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2b2238b6---jojikiwebiwogowedipikutip.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gibamovafepab.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/eaf8e0d173694e40514481fcf8ca5f11/xekevowedezagene.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lodisubemujevosamokip.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/99490715305.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098970051a72---wopelojuv.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20837842976.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/8904960499.pdfIn PDF document text
    • http://unseretochter.com/images/file/jakapid.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/23702992253.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/60246903257.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ad9cd6v2pg35o3aalrt3k6ak44/67953493870.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1627271381.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/nawidozijebefobemive.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/77206116335.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/wovixagakobat.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/nosuduturuvetowe.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/23720029845.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/70693816933.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/49237501921.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/71544867182.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/80108243383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=web+services+multiple+choice+questions+and+answers+pdfPDF 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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 15552 bytes
SHA-256: 3e21861d25d365d0c8c6cb5fd6ffdfbea30f8ace2e1e1188135a7f758f251c32
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 11416 bytes
SHA-256: fd0c1e0763269f885307845af2b2351c5ef048c8a213182cc1cf26d06f873d1f

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