Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cee92f4311e69e1…

MALICIOUS

PDF

72.6 KB Created: 2021-08-31 02:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08d75e0835647c0a17484d4a14321af3 SHA-1: bcd0393f01266c9bfc661704e10b25cd13412e22 SHA-256: 0cee92f4311e69e1c921479c11aff8bb2592961b4f4aa08fc1dc7804b6df3d15
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ccswcd.com/userfiles/file/jivubuzolukeduxekujel.pdf In PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/jejero.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/20168508709.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/disiwelasilelixomazebu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0982aa3321244490d9041ed5b2426f8f/muvewomigujekurujam.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/13add5191ea50002dcd86854ff13abb2/jegaroguligeke.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/bujanagufusadiwolotime.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/47764423243.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/dakisije.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cd62dfc5d27---455013868.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac68454ce7---10015155914.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/dupetifumojaki.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/17188973491.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/03h76bc63njt4esc3268e16aal/fajakesepalimate.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbae65d03---vekirajumifaw.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/33310263896.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/90439382860.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/wepuwuxunorugupudilar.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wototofunogenerame.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1cb01a06---pijorasejug.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/80127425801.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tapoveronugili.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5f2bd31e---vuwoguxugedopo.pdfIn PDF document text
    • http://etre-belle.su/images/file/61710063332.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b9d5b86bf---xasenelexofijuzupuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=differential+equations+and+boundary+value+problems+5th+edition+pdfPDF link annotation
    • 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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 11464 bytes
SHA-256: a7443e8946c9d9cc668537392ed936ffb03d40f951011d4c59bcc090c031e244
font_02_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16040 bytes
SHA-256: 25a600ab45178fe777f4aa1edd9376d7d9569f352c74209dd7389a41172d89f8

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