Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c64909b2a65901…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 04:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bad6b8d05bc08ae0aaf7b82758ab2662 SHA-1: a8370afd680f508ef3d8feeae75f5ecc3cdbc515 SHA-256: 57c64909b2a6590122adf7e826b05137119f7f154693c03d28e84eaee98467fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the nature of the link farm and the detection as a trojan implies an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb72a8c170---sunotikodevun.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/500e173198691570251075c5f4d6152f/18959802075.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/69152535427.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107052052.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b163baea0c8---90743647971.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a29cd0969fb---22458202271.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/be82127e7ecde5882736ac0f13ba3513/supokulapi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098578e8aea1---97906900096.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a508cb105c3908917402583172efd3d6/81024707007.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c2bec61ff---sigamed.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0ae5e5ba---xutofaribuvafizowejuniga.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60f8b62e2---sodonazawuwibalone.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a926357320c---76999494270.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad8b0476---91870836119.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/45nvmti17m219q3i1006edc2c5/891524748.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/67355670837.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n3dnsdmv55pc85grjs441kpl31/32451540714.pdfIn PDF document text
    • http://prosquash.by/data/narurazebetivabelom.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d64cd4a3cb---81635586426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=difference+between+eudicots+and+monocotsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7802f2f7ef---83351072249.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_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 17132 bytes
SHA-256: 21bc01472e685bbc98bdcaf62c1dc7849844eabfe98c12ad6264e5edad7034b8
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 10920 bytes
SHA-256: df7d558d16730226a103ecdae5fe89d95121bc4eda31d30cd3a3fbcad259f765

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