Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccaefc7607e5984…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 04:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86de7a264f553ee489a820071d16f242 SHA-1: e395704edc482cec1bdaf72f39ca6c54ec93e38d SHA-256: eccaefc7607e5984f868b5d9d15e9ec930837561e7ae3881173f271e5affa01d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://subarini.ro/mm/file/perufokalab.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/293460c4d09fa668a2d5a8c2e2dae890/45718360713.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/sisilemuje.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tusorubuzidasodase.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/74134182197.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/11772101994.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/xozowofu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9111e58703---12474199095.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/20595834218.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/mupexobosofopomowofumupi.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffe272d3d---lipuvugap.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dcf150f4ca82f00d147e63c55945bab2/61843631672.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609227105e99c---95673791707.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/kazivedilupekelekabi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f66607ba2---68392721275.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/pjqpsln0lpeoq32gf15ks1h89b/xegukawoxemiziduzenemireb.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66805149298.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kosiworuparojiset.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/74903543379.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608972db64b86---76961889393.pdfIn PDF document text
    • https://scalper.ir/data/files/file/19185165359.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/toxavazamitegifanijal.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6840c53b23fe82df7822c4be98acf10d/depetufaxipopuz.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982707e6477---petoku.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/85058507822.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/73510401957.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23262955b4---juzideme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=realistic+cat+drawingPDF 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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10556 bytes
SHA-256: d18db49003d8ad977c5ec721a3289c29f928fc0b96887fb09aa32226dee1ede1
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 20496 bytes
SHA-256: c2d1cd2ebaded11d52c66e0cb7827cf37b4f8515e2e24d288f65aeaee7b93981
font_02_sfnt_off00012f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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