Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb8391c742d8f12…

MALICIOUS

PDF

96.6 KB Created: 2021-07-08 00:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 84a8f5fd30ae70622649a5c71440230e SHA-1: 1eca63f2d0fd5b37715427627085167ea52196b7 SHA-256: 2fb8391c742d8f123441e7864ba46cc392035a684cb0780c486945dd98464c42
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. No scripts were extracted, but the structure and URL targets suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://aj-logistics.com/stock/userfiles/file/50651516846.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/66fd714d95039cab02670459bd754267/86383961819.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c759c4470c---26091724505.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/gemunaxogoxuvi.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/nudufirojakenef.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e27e6f389b68fcf56374523fc2cbf300/sesirobejorudadasif.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c30301ffe---pekesisixesevijufotikesag.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f99cfb9d---11158748013.pdfIn PDF document text
    • http://redactron.com/userfiles/file/mexapixikokaxosefejukejo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qn77deh0m6nfd29ne6chpmfos6/ravogovix.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/bezuxisasizut.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/wovera.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdeb6521f0---jifeposa.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/sosefokapeburafawuni.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f91d47b3---zigekoxaduwuxakirapavit.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/miluj.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8deb9083---18246588498.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vibawajogobugikimajib.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/mebafeli.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a1f2aa7eccf300fd50a87cd7768e4081/2323518304.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/jemawazipepuzepaposelexo.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/355f1f4b5cfcbe4f6797218ea1cf51f0/26166627727.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded68457dd---xojopebixemibidivagax.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/92076743203.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/mamosinoroga.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/popurawunibudesivaz.pdfIn PDF document text
    • http://www.toptehnik.si/images/21950414650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+king%27s+avatar+watch+online+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 4512 bytes
SHA-256: e8ac9d7b0319d4a73d67018b78a22ee7bd98c041f76712e94226f50a8025be98
font_02_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 18476 bytes
SHA-256: 76b20933fbfe1a8998b7f3a0f7b4096b31a117a482563bad8aff475e54e67d65
font_03_sfnt_off00015ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB8 10988 bytes
SHA-256: eb14700f6620d1dc68f9bf776b7960c41a4b0ee0a26ed16423230a5efe617719