Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98701f443477e8e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 14:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d121ad166acb394bd10bb86603ecc2f SHA-1: cdc2797156338fb0d8eea36e24432da52a19d96d SHA-256: b98701f443477e8eb71c38abeacb380d99a37d01545e1771f6420e3593e68ca6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=icd+10+diagnosis+codes+list+pdf+2019 PDF link annotation
    • https://golf-tout-terrain.com/publish/page/file/jugejiganasaduve.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210712221516.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zunibefaletepujox.pdfIn PDF document text
    • https://medtek.vn/storage/file/sovisobugij.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/18415609547.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/20278125005.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ed83b131c451ec194a166ea2ae4a01d8/nimivej.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/85721359974.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mitodewabopofafagiw.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/dagufolulabulexokaworide.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/14216f5c1aeafcc8894387dd8ab20b2d/22411955740.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/rexudofazubusizal.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s38pje6p6o5gjtcbcgloqblvap/6624466501.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41530681313.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/limulopijesas.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/83683609513.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0b27ac99---gaxirepikibopifoxaremu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a5af195fb---dadetubegoxupofawaruk.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/kfrqukcab9bjeonppta1boimv4/vexexefefuraremokegeli.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/22142769267.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/68928150344.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/49591126192.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/sobemarufiji.pdfIn PDF document text
    • 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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 11108 bytes
SHA-256: f2982d939cf866816f7c5a4314e6555dda2afb6c105f23523be820a6ee7e3f37
font_02_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 17524 bytes
SHA-256: 0d3dbf9f0401e2b2ce3a4f13a2f9b32eb72956241a06d06fa7f9ae3e127496cc

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