Malicious PDF — malware analysis report

Static analysis result for SHA-256 9131cc77f8b68106…

MALICIOUS

PDF

87.7 KB Created: 2021-08-12 10:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5a022225f3aa54e8fc85c5a1c85782d3 SHA-1: 0570b7cb8fd9224770eaff8aa97290e8f1f884b1 SHA-256: 9131cc77f8b6810628ff24c4db471b147f051f27e8c57d53fbe72e491c842980
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://mxm-hosting.nl/img/editor/file/goxuzupegabimakaxe.pdf In PDF document text
    • http://shesob.com/file/files/guzikipugajagakosafebexo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080839609958---56368464565.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/12106968032.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/5745292327.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d59175a3e5d95bf47710e4a6121a3d68/lerezasakunudil.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/makatupuve.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/43955553734.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1da9586393---kosagulawezupogizudidaxe.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/64969377590.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5b1np5c9vo3h38u7kb0j74bc60/topuvuzesuriwove.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5366691691.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/pilorowutifudevupifewiren.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/a4d1o36dp0r73jalifrlgjs81c/xusamumegokaxipebo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee107e743e---32570511691.pdfIn PDF document text
    • http://boxethai38.com/upload/file/36242164013.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/40969637608.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/36574619334.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a145c5fa2---33229796163.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/096k0rh3vrc22bkjkgmfvgqt5j/77657305744.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/76723665290.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/94256517243.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/88378623402.pdfIn PDF document text
    • http://muszempilla.com/files/file/49052970524.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f633c6c436---93754927175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=my+boyfriend+likes+to+touch+my+belly+buttonPDF 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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 11020 bytes
SHA-256: d9b6fb4b3f05f7c58bc5d1fc5497005861d6edac110991959537453ff888b0b0
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 17572 bytes
SHA-256: 1d013b46dde5c4368f9c98f76ebf0d8b2d1df4654d2fb4dc2aeb450968ac15c9