Malicious PDF — malware analysis report

Static analysis result for SHA-256 041db69c26bfc41c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 09:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 448492accd0d99f6385289e80c56309b SHA-1: 6400d2a93c020e546f7af4cd21bd4eb21aff6e6f SHA-256: 041db69c26bfc41cb3387fc2bb7aea20cdffee7835b6589b02e52726b399c8e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://irlanc.ru/uplcv?utm_term=how+to+print+2+pdf+files+into+one PDF link annotation
    • https://tempatpasang.com/contents/files/ziritolapisep.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/86477737877.pdfIn PDF document text
    • http://platcometals.com/images/file/putowupodi.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/13138924084.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/desuwe.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d82cb3c744---4682896138.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c4a35f7f---sowagunakudegadafep.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/vufofamaxali.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/lilifurevugu.pdfIn PDF document text
    • http://mcutech.net/files/30330705749.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2kh7p96nvioqnm62s2c4sfigc7/nofuvezemozalor.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/55173018353.pdfIn PDF document text
    • https://orrizon.ru/images/file/97899102695.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51f89ec3---43217808518.pdfIn PDF document text
    • http://livestocktool.com/d/files/gedod.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b497c431cb---73435462998.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/dolefisojolet.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/30346196215.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/kodesiwit.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/11111561925.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051355481450.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/tizuzatexevolexeso.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/46243328553.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/56334626942.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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16112 bytes
SHA-256: 3b40336ab95d484633a25f736d798ab8d31ee66e3637954def371c34d8c921d8
font_01_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 10528 bytes
SHA-256: dadcc244c0d4d61ce3d51ae2646002d7356e26e76d85c525a58f30a5c6073413
font_02_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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