Malicious PDF — malware analysis report

Static analysis result for SHA-256 f664fc905687a338…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 21:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30b1964bd27ce0a12f1168e2b8053a67 SHA-1: 2e03c525f1d7364ffc9237f8275603b418677549 SHA-256: f664fc905687a338b2eaddc81bbaf9d088b87d1516c62da4a439971898c4de2f
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. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=download+web+series+app+free PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/91174487464.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/46e80a9678c74245bbf2737f9f7fe080/zixogajopagajukagigu.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/71560176317.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/65247712352.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bamuzovixodo.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/gikonemufeke.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/76159515067.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3830a0d475893d3fba8375a87d6f7ef5/rejaresaf.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/rufoxizunafuwu.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/81672527853.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614103e11bb06---61866527541.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ed3b7a4e---goxid.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/81621052237.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/sogikudabowosokajusab.pdfIn PDF document text
    • https://remini.hu/userfiles/file/rutox.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/41594150021.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zabelolemogopipi.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/vosim.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/pujurojojepofozadovaxezaj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416facee51---85631289869.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/526347416.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ebd2i6h5k7ujkc0ek05sqeqese/vusebex.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/robilafalopuxaxubaso.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/62063816278.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_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 18320 bytes
SHA-256: d55970b22505815f1de79990cfd02333a7bfe625a251a2bf16d91033c1002d4b
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 10620 bytes
SHA-256: f06a8d4f44c026ef5d60e41640a55c965c26588929c843e48df56f0079a62a67

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