Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bef9b060c55565…

MALICIOUS

PDF

91.3 KB Created: 2021-08-05 13:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dbb91e014f21b52169fa1bde5d5b951b SHA-1: 8db566ffc37fd572c58c71ce57562210b4fdb5de SHA-256: 90bef9b060c5556583b960206f103fa821b6cc39e6769338a82ef429c9129dcb
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, disguised as a driver download. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external resources. The presence of multiple links on disposable or compromised hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 5

  • 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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c106352d63a---gebuferagasob.pdf In PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/96727655261.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/088f9f30d4bc8bcf296184ae5cec3597/jawagamapudinapivofem.pdfIn PDF document text
    • http://nktrading.qa/file/files/19959285709.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cd3e92fa---97030451495.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/varaxakubuvilowexoxesilan.pdfIn PDF document text
    • http://change-sexy.com/files/files/tivewejose.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035266d706---8340461981.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c067283c634---xodesifuxukuritow.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/31409915421.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/felezikawuwarakegusogu.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/17205391092.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/puxezipi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1c4f2392---sifivek.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d4bc385ebb466f0fa8c97a6d2a1bcbd5/66269105625.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7a9e33fb---25275136887.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/86893302977.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9580f1b28---67667701389.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/vatutuk.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/662c8612873eb1f03fcfc9c20414b7d1/rarokudonebulegitol.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089be9c0d937---70690937624.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/jijevunolenomew.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/503c39db23db91563e45e5417883d0fa/keromalinibujaxi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a385bb29acff617fb3f0a940fbcbc5a3/99830885146.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/54ed520a82c57741648bd50199433737/rokefiloxukajaj.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/df8aedffeafc7c781029ccc6b85b1b99/vikigewonituxadagatofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hp+laserjet+1000+host+based+driver+64+bitPDF 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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 11132 bytes
SHA-256: 7af381ca8aeb8ac5d85e90c32916a9c400126caf1fdb0544a022e327ef7b0243
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 18256 bytes
SHA-256: d537c8d1b1b6c873e451695e9e8edc61d97d34cbc65f5374933899352d6edefc

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