Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11c6c4f504dba86…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 01:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 716a6ccd6334e62c9cba14323da8c9e0 SHA-1: b12319c812d179c479070fd888fe40941f603e3a SHA-256: d11c6c4f504dba865e9939794c2db71899e01920ee91a54b8b2026c9b535ae8f
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF_URI heuristics reinforces the attack pattern. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/d546gpioltc02gh25fjjmr65e5/69941792333.pdf In PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/golubozusimotebe.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/12907212930.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/banukubuxika.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/fudes.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nomakepefipo.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/10097984090.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/turuloxewek.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/13981245873.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jezadejexexefitudem.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/m29ojn6tmvfii22fcl9f0dhr83/65276057713.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/88904460782.pdfPDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0440fedd---besijowas.pdfIn PDF document text
    • https://csn-alliance.com/data/files/muduvapil.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/90161522796.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/69805014797.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161375093b6985---vufulowuzezazasaxovu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/49677546085.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xiwedivukejepizawup.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/53723065575.pdfIn PDF document text
    • https://ismart99.net/upload/files/55953180097.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/jutolofuj.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8c16b3b0---39173096112.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076cee6106---ratazizufilugagom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+walking+dead+comic+read+onlinePDF 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_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10692 bytes
SHA-256: 32be733553b19cd1dd4c72779c7b915b4c9be0e1ef48705495c72f02398b97b6
font_02_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 17816 bytes
SHA-256: e9a5fbb7f8e5fb255b035c7f488c0e5f3e2b87323fa102d072261fcef36405a7