Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af7040b3dbaaad4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 02:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c3358addcf153dd21ac89dfefa6df09 SHA-1: 5c4cd4092000defb3828f2b825a246eae34b2c46 SHA-256: 3af7040b3dbaaad40c14b981e7d9aec3153cd776ab885901a583884dbe76aa92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, identified as a link farm. This pattern suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/uplcv?utm_term=solution+manual+for+principles+of+measurement+systems+by+john+p+bentley PDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898abad64d---54571213127.pdfIn PDF document text
    • http://mfahk.com/upload/files/11952264299.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pepukawoxoxetosotuzudepik.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/lesesijo.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/92530333777.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/97492565559.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078041a17db2---lidokor.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/18602831629.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/20463853045.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/476734811.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/21540762118.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/56547046875.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/vedazazapojozolakixa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711826f207b---80849843856.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/nedomizosiwoxekusovagel.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/pezirurogidofurudi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dp7urnatufkoa7eaea9mc8f93/pulisixatamagezamejeb.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/db17a4f4e6c3365fe00de48b9d42c3bb/salaxesanimijiti.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6734a466813a42e190ae1e9d0e54a60/2801107590.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978efcc57ea---45356264467.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/1702149129.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 11304 bytes
SHA-256: a08f495fff40be5dff834b768e06cd64fc870c25cb17da519aeeb6dfe0d00bdc
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 18032 bytes
SHA-256: 715d0696b1919478c1d6511c21d71f3e6a70b1bd4ba1fdc29ce49b5e34495588

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