Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c465f0b11244a85…

MALICIOUS

PDF

94.3 KB Created: 2021-07-25 14:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74f094dbbba89ca3272dd579ea956a90 SHA-1: e1ee8d6734340de5c9da4e3593f4c1e67eab9adb SHA-256: 5c465f0b11244a856e7b78a0a00642068a8e62febac999a8a6d8b5ae3304c9e4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support this assessment, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://immo-macedo.lu/userfiles/files/96007558396.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hksro069fupvpqoq6dk9t5kr2c/4695044947.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/25692954286.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc3ab4c63e8de3ed258c56497d5223d6/50329857577.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b06ea98c---93584544244.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/06484cd2798fab6041e2baab878ad257/69721639326.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d904c7f3052---lovuwinofuzir.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/25086598260e95c127d1b4.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nawanadakugegaraloge.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/11955454215.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/tedowivalejawufufawo.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/52070858000.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca446ed68---13606292331.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f48d26a2---92847022190.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160991eae44a74---73203581045.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/68228521876.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107100858062352.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39061019256.pdfIn PDF document text
    • http://whatdwellswithin.com/file/63176907330.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210601064519_1779253006.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607011062ae63---wawutipamuwajabuk.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160828934abea5---1997416706.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079017263068---99467187868.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3c6db8e984be5413e01ab8c9f14fc150/panegazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+hero+academia+season+5+episode+1+english+dub+huluPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/47cadd7ce5130cc057c978f4ad3a095d/duwusuzevonigewador.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 3000 bytes
SHA-256: 47d9d2847f345fbf47b08dd52a5c079d6596b85238041d6ead78c19ef2864b7f
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 19120 bytes
SHA-256: e8cd9c00a69b39898ef71c3dd05df9268d36af7f45bb113068d2ae4df607d7d5
font_03_sfnt_off00014eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECA 11396 bytes
SHA-256: b4bca789711cf69f10e173a883e370d7daa5b398c833f4e51c61d45ec82aaf20

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