Malicious PDF — malware analysis report

Static analysis result for SHA-256 842540b2986cc46b…

MALICIOUS

PDF

77.5 KB Created: 2021-07-29 19:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 57c4dc1c84f453c9acb54e83a3d9a4fc SHA-1: 0352576de2c3aea77ed0bb12a9f4b21e62d43600 SHA-256: 842540b2986cc46b0b33be55308be947ea2ec9fe376f4412771dfea8981017b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure as a link farm suggests it's designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=present+perfect+simple+and+continuous+explanation+and+exercises+pdf PDF link annotation
    • http://1utilaje.ro/mm/file/sexuzawivupumusi.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/lilor.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n2qglsp23j2hj70mpb4qnm62i7/govepuludafizo.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/jibedekoj.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/zexitimotofemadi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d9a75146e---nugogumatolipuludonon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde3b9e1df1---79797698059.pdfIn PDF document text
    • https://cecprint.com/images/file/minikidozunowimevomusadew.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/3021875620.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8c1eac0cfe87f8309b9ebbf25e0760e6/tuwef.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/kagifasefuk.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eb0d02a09545da7782e3f8add481056a/1420287653.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c97e9143---75551356154.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57a52d5d8---85420885672.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/65549152957.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/famokemuroluguvazip.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/11566be05f2d6cdb89bb3cca3df97cda/65207717018.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/618464516.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/65255829380.pdfIn PDF document text
    • http://cartopack.com/Images/file/vemugup.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/9254376250.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53fb2315b7---jegoxitinoviridunuzoru.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/3013402056.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/4142367322.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_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 10984 bytes
SHA-256: b1aa238f4440b6fa0b10b4bef8ec38067837cf57459be7538794c3e5e5063b82
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16424 bytes
SHA-256: a0bf7ed02eed3e7aa33a11866a3e48eb8590cf1f5dab4a934a7111db1a5f1dc9
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1