Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab49fb32e3b8b55…

MALICIOUS

PDF

87.8 KB Created: 2021-08-19 01:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f94b2c0ca4ef1ed78bbd1bac1cb97ff9 SHA-1: 4b9c4e38c5f7a3957c598a71601c2822121ff0fd SHA-256: 9ab49fb32e3b8b55cae88532acfe4aece4117e4bd465bfc243878b9e12bcb3a1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://queure.ru/uplcv?utm_term=el+lobo+de+wall+street+libro+pdf+espa%C3%B1ol PDF link annotation
    • http://ahchala.com/img/file/kakikale.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8d71041be---tenudovoxa.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c340b533d15---xinididulobuwozalud.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dnsb3odauismr15en9r4o76425/jutanejizunonagimakuxi.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/zaberuxalejimonoxewazubi.pdfIn PDF document text
    • http://lagrupacio.cat/file/vekesoxizufututeguk.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/givipikew.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/dimino.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/93028583685.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/81490971856.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869b181bc0---58932426352.pdfIn PDF document text
    • https://grancom.by/upload/docs/madewimadorovokupoz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609938804909b---rorikifukakulopejapo.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/60661548913.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/92864030674.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bekilogifofekuritoxaju.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c99a9bbc---59638400319.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d4b2036b---84465440701.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e4f4492ec---26229556677.pdfIn PDF document text
    • https://clinicscrm.com/img/files/1640442828.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/20567760341.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/guzimopemafupafedo.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/rijokolu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e59a1259---fewaluvodesal.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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 10800 bytes
SHA-256: 7785026e41568526c355e16434f00c1043b3ef1760cb223946117aa5f1650b8c
font_03_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 17712 bytes
SHA-256: c43a519e7d6fc0ee659d85a20a37bb6638d03af4f9d5fe9cfa847d2e8082e542

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