Malicious PDF — malware analysis report

Static analysis result for SHA-256 1338b891957f90e8…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 10:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c7d482e498b0378473cb6db5c2a0af3 SHA-1: 2854fd234194d43b18bf0909d1b4e979c80d07f1 SHA-256: 1338b891957f90e8819c5836dc949e75f9bbcc072ea5988d202f6ccc727af702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://philabc.ru/uplcv?utm_term=snow+white+with+the+red+hair+streaming PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509131141676353.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64d6e972f---vetizakanazuwatig.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/13337523615.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/bubidetefoluzatumoge.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/sowuparugajefiregododirib.pdfIn PDF document text
    • https://animaliadielisa.com/file/16153038681.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/92268883648.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160963afb10051---monefotiwiwudopefoginude.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejavufavotusi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9e55c8ac---nofepom.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/cab2e96daf3b9849ea01f59968e881bc/gununufadoj.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805183527---30035586585.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/41447740818.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/336d8c71cd93b39b76b98026d7f61352/guxekipakufijinisenera.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/92391650469.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d6f3e91bdf5d87bf71c10bba1b3cb121/86366627398.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e0d779b6eede37513c0bcf6137dae2ae/jipixizibofuxavepamuloz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0e8055a9---40830011059.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87a3319b5---91127943799.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/57081697619.pdfIn PDF document text
    • https://mavibusiness.it/file/redejifasuvanovivalur.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/zagavalaludube.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f814ab5e4c---27796985130.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/151792568fb7a5ab5f533ce3fd55d4c9/24280809170.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_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10812 bytes
SHA-256: 186d0bd47842a1441b9aab39bd2c328f65a6108326c02edcf1ba7542671ede38
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 18376 bytes
SHA-256: a737e3f96bc2d2eacb778b6913dd7f1e96c1144db54c9927bb176676e6a4dde6

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