Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b7c1e5b0ed3bbf…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 02:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d52a838f2605e31a43b5632d08a97f4c SHA-1: 471d08004251c29775c39ae323edbae6bbf41bf4 SHA-256: c1b7c1e5b0ed3bbf201aeeb760aeeed820f3388c4a7e6404f0f81fe710c78ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=autocratie+d%C3%A9finition+pdf PDF link annotation
    • http://vitrine-prof.com/files/rogutudogewusegujaxevada.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/28436118205.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/50749074442.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608199c78a3f5---12565655175.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/xazuwijakikako.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/35857068949.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/xejenipuvari.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210819044628.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5f769fa1cef9463736ea69715bd2f110/wijukan.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf642826c---29944948083.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169cb44201---lefodowamuragovokafetug.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/18910540769.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d643110b38---29643563010.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4bc36d868807d3b388062de36c6dca6d/zivezagewumetogalenep.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161137d16ae0ca---52460457957.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785fba95ef9---luriv.pdfIn PDF document text
    • http://freetds.net/userfiles/file/77413289172.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbea6033c0---12314089448.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f9bf3bd9b378d6b0292d14d49b44918/58902523612.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/zikoreregidamaw.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/japazotukoloxajonolonunu.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_off0000c26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 20564 bytes
SHA-256: 0dced9f390fa2580eceb4999334c1e36bf2c905aa287016d1d3acaaef0096d05
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10636 bytes
SHA-256: 924c3461a4da8f10e5929f9ca55672bd90d50f512a7c6d6a525c11671cc6272e
font_02_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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