Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b99b812242c826…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 03:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01bda21fc8670dad7d95a5bbb0e96e03 SHA-1: 72bd850b3ac8f55f9d2392ef80b779ad089f9cc5 SHA-256: 30b99b812242c826d0205ab111ab551b50d4d981fbe6834379a87dd691946def
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The presence of many external URIs suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=equilibrium+constant+questions+and+answers+pdf PDF link annotation
    • https://sbufficio.it/file/81343169027.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8110a84e9c---sufasobuzawebogejafus.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8949331d5c---zatinuvexumamerinixuk.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/1869009073.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/mofosogijinafiloleje.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/49d911eb254a863b932c23f543b56c67/vimuresasazosujisijofo.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/83371494009.pdfIn PDF document text
    • http://thedreams.cz/files/17061169741.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rajumigiw.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/97178593487.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/51262993392.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/21189356635.pdfIn PDF document text
    • https://inncredel.com/uploads/pegatetebiximirefepe.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/maribopokedobamojizezus.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060911093980554.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/rekelitijafakilupofuj.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a4fcf8733468aee521ba29ad63d9d178/pivikonirinodetezomulirel.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c98959763---7161746118.pdfIn PDF document text
    • https://netlandschool.cl/files/84917878518.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210617_A679EB24ABA35FC9.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa53eae9520c974256cca8a0d8b333cb/9397029739.pdfIn PDF document text
    • http://farashimirooz.com/files/79550452691.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/rijulanoloji.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a9f73923---97619374281.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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 11236 bytes
SHA-256: 44117ef6dd0bfd49f1b2fc053740fd451ef9daee0a536771116cced639f3cd9f
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 18984 bytes
SHA-256: ee911ea437f748bebe257097dd3ddd5b1d0b2247b5ea4d66642252a0d4a4f2a6