Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16a32a6b7dfc7ef…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 06:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b337b37e63e19acf0801774a4ddf9fd1 SHA-1: 4eed6c0779794158797dc4ef4804e26765b11955 SHA-256: e16a32a6b7dfc7efc5b4fc2527a2c3a3a3884f8cbf64235d5796f86a245f200d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=swimming+pool+maintenance+guide+pdf PDF link annotation
    • http://fjzy18.com/image/uload/files/todefelexodigel.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16110181f7dc2f---ridegomikujutixipebeg.pdfIn PDF document text
    • http://asvpp.fr/pdf/77913874319.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jekiwaxonubepuva.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/dorebopokonobakawe.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/52149331279.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/difutonomuz.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/7248262287.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a314abcbf67---49220960783.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6f90791495564f04dbf30623e18e34d7/bodom.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4qem5j1f9dkc7t22ertvicr4md/69190574778.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/6627708988.pdfIn PDF document text
    • http://ropesadventure.com/d/files/bulavitadibevopenidinavit.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/gamudevojifopedo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c581f15450323e24d5b12938aa496dd8/99818304683.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kuputedazofojifub.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/likemidekotud.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/2381401353.pdfIn PDF document text
    • http://topas.lt/userfiles/file/notamivoxu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/pesatalemepakutuneboziv.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/73285956907.pdfIn PDF document text
    • https://bfull.ru/uploads/files/93236850649.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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 10956 bytes
SHA-256: 64813eb4780e6347f911ac7141ac4a174d5c18407ec3a31ba75626ec2ee4d347
font_02_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16480 bytes
SHA-256: 8e65a72a674851de29c251f758badf2cd55744d79eb32fb03c2e08a39e45e6c1