Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a4b6b922194c8b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 23:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f838a1e23761cfb8caab70a4bdb5b110 SHA-1: edff079952ab0eec8ad089ded810c0d50b7ec2cc SHA-256: b4a4b6b922194c8b14e260a49ed10c02944ff29608f830b8ed07b6a21b1935ac
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques that could lead to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=version+5+android PDF link annotation
    • https://artesapanaderia.xyz/aym_image/files/3427520169.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/rogerit.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/60693866768.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/94693610725.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/37089933762.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/lebijavufolirebori.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jesubifenadituper.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49f063078fc585fd4e4dc6ce3966778c/34935065234.pdfIn PDF document text
    • http://chinalabware.net/d/files/susoladubofisi.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/lemaperolifuduw.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3f0eb935e3eeec1ee5f9f4875517e6df/14399822979.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56065180039.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/76431750021.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/13290924930.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/66341e7d6da068cbe20a1e922a59e0b1/winagokef.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/muniguwosefebafelome.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/falipape.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/nuxefoxepaxoroxib.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091103324973499.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/96206513967.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/futonusunevuvagevo.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 17592 bytes
SHA-256: 3c1234ead0fc7af4268106972b71ad9d2ff57c6eab16860f76af6a0a47a484b2
font_01_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 10200 bytes
SHA-256: 59ee35dd8f1c882718b161f1530213d7a5df6bcbd4c94643208b5561ef7dc2ba