Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96199ffa0d658f7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 05:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e805e5715be36eeb3e1519d9263182d SHA-1: 9a003568fd88efb1dd2e598ffe34be95f56e2f82 SHA-256: a96199ffa0d658f7db565ee1c2b8380a9abd86bac8529bcafe7a009b4ba89fd1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://reklama-v-sochi.com/ckfinder/userfiles/files/parebawujerel.pdf In PDF document text
    • http://slsnn.ru/content/file/96895823907.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/51404284425.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e97a9ac100---sajixilunatizunudo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd15d015e---10426099641.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1eff1cb11---98845620401.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5ef5164e---51349967366.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bijezaxe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/20023182659.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/nepofiki.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cff814718---vagigizirejajotipa.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e5tbsgik0ard00qsf0i8n6lq3r/zozifur.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v103fi41t0d16fb1f5p59ptr0v/27343925385.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vudo8iemh8iri2uo1voak51ttm/75516916762.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c496b40dd7c35c4567a3cd6d7ef1a75b/gakarutepilemenob.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/rezedajajazaj.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/zifenujasutatovexaregalup.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94ed9d4e1---36557889306.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/lakudawagenejumotimu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/ponatetazagifafo.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/guraxewopodedaxunomufu.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/79342662423.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/firivewisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+combine+a+word+document+and+a+pdfPDF 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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 17776 bytes
SHA-256: 0d46e2a23a1937826abe26c9fa45eaa53749dbb1f729c33fa911ea6d919853db
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 10884 bytes
SHA-256: dde9bb18ed0a2fd77e704ca08822e1be7d45d048b05fce8a4433590041ac59a9

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