Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a6ed7b9acaabd9…

MALICIOUS

PDF

87.5 KB Created: 2021-07-24 03:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 245b34ede9d7ba4d27ce2fd3a5d8ddb3 SHA-1: ec32d609ac98b2e50a37a00ab11f93773958d1bb SHA-256: 45a6ed7b9acaabd96a6a47738f717c6228093f01eae243b83dfebaf732fdf8b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and link farm heuristics indicates a likely attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c5b4c38aa28878a24b2cfe192ea757a7/gipuzo.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d13ffab315d15653ad0b481aaeb5a9be/29374892700.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/72226301403.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/32303c0b616b09e049b3f15135382408/fanajevonigelo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607347263c60e---lumopikos.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72c7da36fd---nisepugolanagotinavofo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/80d6b5d28b45bd6fa65052ae8b4b129b/bagokinobowavivutepuze.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/18869811841.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/86017985205.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a923ef82120---bisesubezo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef380b5831---92306425038.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vanefe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a6c725c60266b8b87e01a41317540ad/63524135905.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/sisivobemuwopubez.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b560d26c---dixuwup.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea5f92d45---sagezu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccac07f68---92992584512.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/xababijajoloxijavami.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5iktvg8eoboqoh71lkc18bgim0/fudilefugapazazusipaxuw.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/10177546821.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k8f4lifepl6s1tuo1bol4b6lld/49853252179.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/rakegorufiwubixinesage.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lukemuvezidifokenepijaka.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///belunewewivazidowokiwot.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/boxopamategokonabokivovas.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1765baf500---lukazilekoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=www+mkvcinemas+in+bollywood+movies+listPDF 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 17208 bytes
SHA-256: fedf6242378ce953b41731412fd7b83b4006b680b265c2089a27c6aa259d8624
font_01_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 10920 bytes
SHA-256: d7064ad624c48a48daad075f5140d1879a88930ecad6e6938ecd884a61e82cda

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