Malicious PDF — malware analysis report

Static analysis result for SHA-256 d225e4cabc76b650…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 03:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58197d3ea28e504e563b1a4bd03f0fd7 SHA-1: 1120306b57ac6a0ab8b5f3c9b7833b08b1cb9c75 SHA-256: d225e4cabc76b6509220e88b1629f0d009b557e827eb90ed064854b0e6df5080
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a lure for invoices or payment requests, and it hosts numerous links to external PDF files, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and linked content point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a86e6b629---fumuzixutebe.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9680f90f9eb4bd18535fe1da6e14f2d8/sunaxidizusi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xobirubodobifuvekaredo.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/1311374614.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0pkvn2m94uomvjr89f14pkid56/vigelavejukemuposuza.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708e2496835---tejomipositorevilad.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad73f24205---lorasemonawexotorox.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/92du1vb9vasebenecd9211od52/19039805246.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/faboduvefaw.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lifijekulakexeludotigoz.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90383881921.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/pororamupoxudala.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/dosak.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/tebunaweviwu.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/8381493114.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/98054013c66ec012ee823588adbd9cf7/wilekuku.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ccf15621---12509454590.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dqb11d1vr7ts9tpkut7mi1s2sm/jukadudovudelagusotekoza.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f024a71d92---28451493852.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096650b4837d---41430074745.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/wezevelesejeba.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d22396edc3cdcfc00a17c21da67659cb/47425404823.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b052a4be45d---wizotepudokunitekewijeku.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kerezosagiposukiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sample+email+for+outstanding+payment+requestPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16452 bytes
SHA-256: 0dcecac8388072da73021607133afa5a74c42639a7b14c5627d6477cf77c3103
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 11276 bytes
SHA-256: ccf963572ed5dd93354731a92be23f3704430c37e46b76f93513d207feaa0202
font_03_sfnt_off00014300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14300 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082

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