Malicious PDF — malware analysis report

Static analysis result for SHA-256 2957380ba9c092b0…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80eaf35554775569cc9e20a56aa5ac68 SHA-1: 98e47eac132f2a30303528bb2844d074ef45cc7a SHA-256: 2957380ba9c092b0aa5b72e1063c513fda508c5a65031579bfdec1ffdf2c9e97
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate an attempt to obscure the true origin and purpose of the 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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2c0abd9c---metepevowugigademubekisi.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/7892949269.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/3622169978.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918dd266cc6---wofilizozu.pdfIn PDF document text
    • http://adveotec.com/img/file/45061280363.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/fivazu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3d231001---jumaluzuxixad.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608706812a992---89464722676.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2750c5b870---12105274550.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d33e3ed0ba9---jutuxuvisopodoluxiwi.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nezolinaxejebit.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/75888042524.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/miwegugodopikafusuv.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-9/20210609003820892075.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2e558cb97d69f8978e89ed8843c8aae9/kewurawuviwenodabazugov.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/75074695357.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899baca91e5---80605525463.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/kutumudodeno.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/64554767711.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e16c681c---32970862136.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2d875d2f4a20d96fea1a87b7f370ff03/gorelawumem.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/tesit.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc88b303e---momogetuwonoleje.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec596ab79c---lenegituzipimenutojopul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=accounting+entries+for+deferred+taxPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16872 bytes
SHA-256: 94e7c5fc813e28b7f7ea697f169cc8dc65ed28381902f801a3954db516fa4221
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10788 bytes
SHA-256: 67a73e885fa28a49446a32770df68212fb264a16c06f16dc80bef9f94f156571
font_02_sfnt_off00012c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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