Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c88f4e8608cfc0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 01:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc3a16ff59f3d2f7a0ca721a3f932677 SHA-1: c4f1400160872419696c4afe1d7c20b95c8eb427 SHA-256: 86c88f4e8608cfc073ccdd73d809e236ed3f452a1e84822f27505d2e06d15bd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on disposable or compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI findings and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=drupe+apk+download PDF link annotation
    • http://cerescommoditiesltd.com/Images_upload/files/jadabor.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/87134266988.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/52885362041.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tubevefasidoriwixezivo.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/70826811895.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dugikom.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/97542395227.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/85f13f2450092b9c7d66c42453781ce1/54046413595.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/78413390727.pdfIn PDF document text
    • https://jin-ji.com/upload/files/tipokojevedavutulofipezi.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/80998162755.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/45825242901.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf671716c---vasuliruzudimojajolufet.pdfIn PDF document text
    • https://cartolmania.it/file/58559207575.pdfIn PDF document text
    • https://premium-house.uz/images/file/xomejifebega.pdfIn PDF document text
    • http://c-six.it/userfiles/files/8835176889.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/kakudugirupate.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/97864925065.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/wuketixov.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908120150.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/viwojalomeririle.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/tisipek.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/kuvadijojuge.pdfIn PDF document text
    • https://sim2007.com/files/gegorajejamomaxozu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/05165c0bbecb23207999c634776a59cb/subesowotuwowu.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_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 17696 bytes
SHA-256: 061f6887374b3d9ceec8e4c788610532c0cca42e571c46ce9857db109e4fe47b
font_01_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 10308 bytes
SHA-256: ab50b49528a2a8de0c26991f7f9a3471eb168df9a037b389d629115ca96bc347
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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