Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30254f4d6e738be…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 18:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e566cef58961f6fe19a007698360e5a SHA-1: f756fbd5d70d72de267eb11e3c5a55f0ba777075 SHA-256: f30254f4d6e738be1a60d99db29930f1b35852499ac532726495465a44547b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f5f2aee1---50756356645.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf319e6220---47101773861.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6cbc1230c---vifukiladuf.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/64923447187.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/77555702422.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/423d89591550e358f99e2874ef454565/99262554716.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/584b99fee77b9c0f4e6478e3cb9c0f17/rewugipexofuberomazoja.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115bfdd73bfa---22621489184.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/zumipadajod.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/fizomijegujiloz.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021082214750_157815634.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/9276517664.pdfIn PDF document text
    • http://kccmaul.com/files/files/31558998845.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf19b8c503---rekuziliwepasigut.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fcccbbe3bbfe8b6b6dc97f6a04ecdb7/fumekag.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/28343304111.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/79786058242.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/36450712590.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/68403145113.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c308d7bf4d9603bccf7aabc1350c3ab3/pufalolididabe.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/93215344941.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ohvchtkm3lpf6jlui151aeq7a7/wulomadom.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/59128878261.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa63ae670---lokimibufuxevovedu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bomal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=explain+why+all+mutations+are+not+necessarily+harmfulPDF 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_off0000b8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 14776 bytes
SHA-256: b6abe852d3dcdf9bd56048400b4926e1633e95e4cdb274dccfd5823621a61ab9
font_01_sfnt_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 11128 bytes
SHA-256: 837860331b6da799a6d9144bf4c8e9a11ca55c5ceaca3b57113d7260246cd493
font_02_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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