Malicious PDF — malware analysis report

Static analysis result for SHA-256 b363cbc8e9cc6533…

MALICIOUS

PDF

99.9 KB Created: 2021-09-03 20:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6dbd186b22343d43f67a1ccf4597bcc2 SHA-1: e6fbe4fb9f413040c0d1070ad160f6a66ba023ad SHA-256: b363cbc8e9cc65335d9a9334932854205325ba00aed6130ad27a81bab27e998b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://museuminiaturesbesalu.com/files/66482564923.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74431f334---zebuxawuvugufil.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/sovoj.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/foxibesozavonaxiv.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/wobogovefekiluwomusepazaz.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/50942244356dfef36ed739890dd42730/dowulive.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3c1926d2---joviwaxoworojevavojigafax.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/39241612501.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7f7568f4ce7db89d7dba34fff54f8d3d/kobebepatikisif.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/musoronova.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e8b0a519b358f79e4439d66bed1e4475/76902283719.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/53260279285.pdfIn PDF document text
    • http://ledins.lv/cms/file/80153808782.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/99380005017.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7bb5c298---dosejidobitimemira.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/63b5ea738f923ccb3467be5e26ac46a3/90345195630.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/vumutamojoku.pdfIn PDF document text
    • https://migger.dk/userimages/file/pagutuvoreturef.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mkv2c4n3hv8svm9ouroibq0jcr/sodigibobemibivelobiv.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/surewogeraxa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/73b654a74d6930e93d11da42602374e1/marusoxazivuxexogewimo.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/70479605071.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/fedavatokajetanug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=different+types+of+solar+radiation+measuring+instruments+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_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 21980 bytes
SHA-256: f1b52aff9218e840c8ad02b75c018a3a22fa0e634131ee1127a9422330b4711c
font_02_sfnt_off00016870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16870 11056 bytes
SHA-256: 74d96d2f7a103809b90f9ccfb3a027a9482601b12f9193446c5f706b88a5b53d

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