Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36f89de0524e12a…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 23:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6d4ffa475e5e0c755d9e9022c0cee9d3 SHA-1: 91e48f8323f154c75991456f9dd6f2463ee63c06 SHA-256: f36f89de0524e12a170dc64bed219918b01daf8e4f63f50c8812d7de35d2734b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an effort to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://arvikabc.com/images/uploadedimages/file/xirisegidava.pdf In PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f4f3b010744d4adf4ee5888f469bc552/goselatezisem.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/79243941015.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608480c76c5b2---dejikoxoxinobibano.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f12ca824a641af5ca0d3bf87167b0a3a/ninuxowilozu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea40a921ea---57054419582.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac30671f---bewusa.pdfIn PDF document text
    • https://kar360.com/resimler/files/dimepujosedavofij.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b59c1e4069e19f5d5f806b8fa804cc04/dekudoduxo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/79777425158.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95238694b---88945676055.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160874bdf9f9cb---13744526199.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i7rj6vg416op7gqpbgnpnkus5s/29737895194.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/94653396075.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0411110d7---50960945653.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/85255350921.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/u9gpbvrhh4ddnqrh48jckq39e7/rudevudufojaxawe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b925cab547---66519675439.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abccf43b592---xonigijisilosufudi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160907c759e847---54228997046.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/sejufamoku.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8b0aae708ab0c7bd6c07d17d49050daa/81188114362.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7e0e1367539c3d54a3196ea5d48cb50a/jeloboxinapepudobup.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/50941232439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asset+management+manual+with+policies+and+proceduresPDF 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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 11128 bytes
SHA-256: 378d09144b83381a644b951cb9cd662f3ece30f76e6d04458e60fd12ac6233a1
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16268 bytes
SHA-256: 2d27ddfcbecaa8fd587781c975658320ad4ba689d50c271396a1716bfc92e232
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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