Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db53a68aef3ebdf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 21:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7dc241a970ae8483060ef989d43694a SHA-1: 58cd63328d9a29bb651bd40b460f00079e8face8 SHA-256: 3db53a68aef3ebdf5d326a22bda8d8f59be3a7073f689aeb10a315eccb1bfddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=mmpi+questionnaire+pdf PDF link annotation
    • https://100tmt.com/uploadimage/files/20210915210550.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/22305876254.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0387bdd35---lekulezaxaxuferujenavoz.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/92358691978.pdfIn PDF document text
    • https://ikima.fr/uploads/file/42867965946.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/97648679093.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/50865171301.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/xujadebipen.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a693b0927---158926704.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b967decd59786b22d6be82b87c92a49f/21289051144.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/fekezezisupugepa.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/90165372358.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/nidupodanelejulunaxoresip.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/tubuzakirolakesaregetub.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/43454770687.pdfIn PDF document text
    • http://modern-pro.ru/files/file/zijarokodawonomi.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/64234212370.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c6f6bf3210fa9200864ad839783e784d/zisapaxinimasenalodow.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/bogovelaketasenif.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/zegarenuvepaxivupoziwu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-12/20210912125027546741.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wofuxigewasamovuvozodux.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/21011919005.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c24184841a536b338a07ad906d561c43/70019579268.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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 20452 bytes
SHA-256: d332ac0ff4a146aa207f053b7d0b57c62012525c9fad88953e4f1ce5e92c348c
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 10852 bytes
SHA-256: 26962213df0bad5251795a4bae82353be38d586251fd0613bb23cb7c947558ab