Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ef781c981a5239…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 12:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc87f7cf589cdf008f0cff2b8d201084 SHA-1: a4a73543b0e3ad6aadd09992374b62859cf7d745 SHA-256: 46ef781c981a52397dd33588ad88db69428ed6ce2819777dc22745dad5fabf7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content.

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=sample+paper+class+9+science+with+solution PDF link annotation
    • https://zzarosiscarampola.it/file/dowadedegefamupadoz.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/65038623916.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a850f512---wiwomenotodemufefel.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7346ba119a---4553890188.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/badixupok.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/349384e2646ac93b35366bbbe6474e1c/sedomowisedixulovimegeb.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c087d249541---6916958238.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210523220845.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210621053536.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/754da01b45398d50388c1fc4fbe0f8b2/95543171355.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/88323668860.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/82b232fa1229b1471f2887c709eafd99/fapasonemite.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/io18rokdh22s1md6r4a5bu93vr/tusesigidowakolis.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/disikugoxefijelitugur.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609631ee6f7bf---10539478755.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/walogovat.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e01b53ab8b406ec3f2f51d551ca6e906/5321222679.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/321c52505760c4f5112153e49a2967bb/20476114830.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/6201195133.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/89227637869.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/77475534752.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a6fbguibkkr6kc3qorel8nlmguj2tcst/kegade.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/gdufh54kmrjdrg2fpi91gf6tpq/mapam.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/16466674313.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4ba588ef---59559788946.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 11068 bytes
SHA-256: b6a4fbc0ea5d2b894d61e083675aad7d0d7eea53dbd1813b6d2b538be54af883
font_01_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 16540 bytes
SHA-256: dba82505b1dd55fc2cfa5bdaf528eb714fa765cf7106220f9ed76dd4f08e7287
font_02_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1