Malicious PDF — malware analysis report

Static analysis result for SHA-256 3523209d53e45276…

MALICIOUS

PDF

91.7 KB Created: 2021-08-02 18:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18f381a6315292bd153ed6240a40daac SHA-1: 38f85f92037e4d036a25b1fb30f454f9328e265a SHA-256: 3523209d53e452769e8b1d2e75291e6418fc1daefdd4ca0c6e37dcf2cf648a0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b431a5b91---99613500310.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0f1df5e7acfbd73be50ae9af982604f0/bebefimarereti.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/xaforarat.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/33137868333.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/957f23d0b94e18af7076bec455009057/nugakepemaveje.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/ripaturogodetopowukid.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/08c27688e02b255b1de71b6c3c2ce4f1/16012599242.pdfIn PDF document text
    • https://esz.jp/img/editor/files/34338186730.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/83118715257.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/zulesabewikat.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784bc5894f---18648962164.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/kekufesozotaguzo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89f1267e09---sokuzukojogejot.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/korutujiralovubolifawavu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160affc9332d52---sezananukuzekoneser.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bonusodesonisivugiwasem.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/80097749216.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/69014769597.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/19992393302.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/wuloda.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160733eee6bbc4---3475948330.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ttai0iqltd55vqlbhjhu2aka5/90909340151.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/38010680042.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c804341b7---19373394889.pdfIn PDF document text
    • https://digireg.org/upload/33076742003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fisdap+trauma+study+guide+emtPDF 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_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 16504 bytes
SHA-256: d5f0668e597d2013af92d2266b6a91a02d8d45e73923c82cafd3ea3c5b7cb0f8
font_01_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 10656 bytes
SHA-256: 3d81a34632b005e4db56f8dc6701eaa70b911ac44b4a5c99c8dc2af0b67c6e1d
font_02_sfnt_off0001478a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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