Malicious PDF — malware analysis report

Static analysis result for SHA-256 676746df0a62f6b7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 16:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd49358fb653d63b5d656ca3d62dc387 SHA-1: 7b1aa0c6cf33701c459a887bce2b609ffce10b7b SHA-256: 676746df0a62f6b7c8040a06d37d6ce01c643233c4d7a59a44ca23361fe64b00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=worms+2+armageddon+apk+download PDF link annotation
    • http://langeline.com/ckeditor/upload/files/72923940126.pdfIn PDF document text
    • http://trubaopt.ru/content/file/ziganalol.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/78799470749.pdfIn PDF document text
    • https://onecre.com/images/content/files/wonenabozova.pdfIn PDF document text
    • http://byecook.com/ckupload/files/nikejaduzuvadetim.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/53920530210.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3b05baba---7706899856.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d326a33641---5461834196.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/javerasejiwixelumovonorol.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/58410405493.pdfIn PDF document text
    • https://penal-garazh.ru/files/vanim.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210912_20D81631D6825A48.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5527bf0c---zisexoburerotowuxulila.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/javepepisetefafo.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/76261529037.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/fuxupe.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/48533508379.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/72hra9ilvgelancuk8834g6krk/xuwatilin.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/pilinerodewoxizawusunawu.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/pagamexikikub.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/sivuwiwi.pdfIn PDF document text
    • http://contelex.it/userfiles/files/38349791265.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/6044629692.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/29473030164.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/31619124915.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/ludigoluvavabapewaxedu.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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 10836 bytes
SHA-256: 6c8b97776eb73da27cc8959d9a7d09eb68e4913da90ebaf3c34474e08b9d2b7c
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 18108 bytes
SHA-256: 42c463f1d9e11d7273f7d59e9e6d2c760d451c6f6a5ec441476bcce5b356bec3
font_02_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1