Malicious PDF — malware analysis report

Static analysis result for SHA-256 624341d795e81113…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 10:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc98f52875777979741b7b4acb431785 SHA-1: 5956503581d487d00a001289eea802a5ec336ea0 SHA-256: 624341d795e81113d18930bef19e76f8441f7dca8a33d3befa3d04e09e7f1d26
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=how+to+remove+an+icon+from+android+phone PDF link annotation
    • https://tidymoney.com/ckfinder/userfiles/files/zagifutofelorer.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/rakevarepifikevixedalajar.pdfIn PDF document text
    • http://spharma.ua/files/file/76878799340.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6be5ee31a---jamujamotaxovinezajomuriv.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/xakuvelafaketolutelevora.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/22024265226.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/karar.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a503f54c3f9cdfabd59517e17d1e57c1/87852027156.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/noletelevumolekigigurora.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/parojunesane.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/wefoburulafekusisusawujaw.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5729a494---magakep.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d22f3ee3---29503893055.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/756226ae8f167f2153c7526a4e02945c/58752487831.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wubamapujusisujolomapusak.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613529facb076---52218256150.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/bedexa.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/16685831993.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/18799308650.pdfIn PDF document text
    • http://toroisg.com/public/images/files/xudefizax.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/78618974462.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/fopuwepisa.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tazimafofuga.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed04a476---20660401471.pdfIn PDF document text
    • https://pratham.one/file/wibimogenatowi.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 10816 bytes
SHA-256: 414dbc7b8b3e2135f147ca5e0d242c05e5299b290fc9e12d611218912f85a334
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 19412 bytes
SHA-256: 1e815f2a89418fe12b58625d74cd5dc315e6a3f00c617ab899d1add40b868e32

Open this report in the interactive analyzer, or submit your own file for analysis.