Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5243330e045cee…

MALICIOUS

PDF

94.5 KB Created: 2021-08-26 05:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9137d667b55f2e4ff13ba024eced2373 SHA-1: b1cdda6ae9d06ab4d179b0608ed7a3a10dc4af22 SHA-256: 3c5243330e045ceef09d05bd4322d2cf10d3ed7b0a66be24b26ddd96bb378da2
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1ue4add3f29h5fmvjr8cdud5p6/36469263989.pdf In PDF document text
    • http://denki-shonan.com/uploadsfile/wivunedaditupuzovesobaru.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f75192aff---97962144056.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/43872969348.pdfIn PDF document text
    • http://446888.top/userfiles/file/91112691812.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/j377q26pdihij6so946qodd4mh/30261680836.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s112a7hags4rk2uhivei6rrhr1/361693737.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0777bc038---nugosatujunekudufazin.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae33d969f---47857908182.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/58026863964.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dovaxovasal.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3314b76bc---64528656724.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/13352094220.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9bf7c342c---64002955183.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089198d8cb18---vemegobavolaferaduxovito.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/epun06s8m1lvcjokd0tnq2lg43/supujanesos.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/35537999446.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9307c0b805---64519363388.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/6687111767.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210819_14D09C8818E1784E.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74338595841.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/20016279334.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/vobeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=enthalpy+of+an+exothermic+reactionPDF link annotation
    • 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_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16980 bytes
SHA-256: 17cb601bd96dbf25b3d9d8b472cd879aeaec4b40f85cc5c17f04274d7eabe058
font_01_sfnt_off00013b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15374 10776 bytes
SHA-256: c9254b63189b7853e1e4d7fab93a4a10f525f3b79462a9994afe06eb82d53c6a

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