Malicious PDF — malware analysis report

Static analysis result for SHA-256 df456c9bfc517157…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 13:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0005adcfefcb3e4f4c3b730b0181df5 SHA-1: 646b3d5d9eba251add9509d2ce043c222434e2b8 SHA-256: df456c9bfc517157968bcbe7d4d52a2b356abc76804473cde9bd47a68407a850
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using link farms for malicious distribution.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://samavetpharm.com/userfiles/files/81109942697.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e578228d---monuduxagageloni.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a402569dfa2---fofokurakigazajibel.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/33001162794.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e47b43cb3---leloduxo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ld28md0crvcf7rhod6r9sefbvj/wusanubejuvodepesado.pdfIn PDF document text
    • https://petala.gr/userfiles/file/60756684609.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sugowezulu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/70198861342.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/xakivovezibakenavesape.pdfIn PDF document text
    • https://x-software.cz/data/file/35071838599.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/75530952532.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb59592e8---46968851657.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/35782438924.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/34805122529.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1cbc4e8e7---zigane.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a489f0c8bf0---83376636571.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a65e382c5---20608236003.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72653327800.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fb8ijgfk9cl9m6dofhivv6pp0l/49548144680.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ced65970---lobigep.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/68291304967.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210722_60B3EAAE1D69630C.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/wexamuwenixelawoxujadakop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bcnf+normalization+in+dbms+with+examples+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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 18212 bytes
SHA-256: 6387e58256492ddd3fe5c5adb6a5cbe530373ce5a87612ccba4e21fc0ccf91b9
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 11328 bytes
SHA-256: 3e5e0e5782f7f15c5e25a4a36972489042f4098f62ec6f06087e304448dbc20d
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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