Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a889c0170000c6e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 11:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19035eb3be79d89d3e06480d4ac32eb5 SHA-1: 24834046cd3c2a5471f6f320834e73ca07169e8e SHA-256: 3a889c0170000c6e4809a3c10ca6668fdfb26e90f10dfdbb4d821d4a13c9589d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs further supports this, as they likely redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=imo+stcw+95+pdf PDF link annotation
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/kiwevofival.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16084f230e34ff---45736181031.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xizevagopaniripunur.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/todolimevupovig.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/tilawufomigabufalaw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8097b8c9---vupimav.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/23138249792.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/47677121286.pdfIn PDF document text
    • http://huefpdf.org/upload/file/lesawarire.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/loliwekelawafomodi.pdfIn PDF document text
    • http://cycling-software.com/files/file/16342903294.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d619d104---xarukojiturogemerivo.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/80067344939.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081caff66368---keviviverijilif.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/sunajugupi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/xelojefububutixefapuxela.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8b5bdcefd6011f7d9410ebbd563ef4ff/beredaxalogodamepejitidu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce6e03638---1650119988.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/87907442821.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q8nr0rrhb9tpfclh8bkqbmjbq6/13326644233.pdfIn PDF document text
    • http://philipsphotographystudio.com/86247483453.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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 10484 bytes
SHA-256: 4b04bca4af3cd1f45609fd8d1f34e8f26648b853ecd4d13dc9346d6f4668fda0
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 18344 bytes
SHA-256: 2da55ef9524a6e6a2f3f1cdaa9f87f6b01c00be0cbc00f2799e65d4b0c7b9ea8
font_02_sfnt_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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