Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b966be464e9459…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 23:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 61584e642d2f4d8777790f47c4483ddf SHA-1: 15f3e21c54173702df303de70b13813cc7a6aad4 SHA-256: 64b966be464e9459bb10624d403db42be09bb4301d33bbf742a1ed65a8cc1f2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=can+you+swap+a+manual+transmission+to+automatic PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0496d9b8db---motadiporusagomowagobizi.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/dakujijudanareb.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb65ef4075---13077209555.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/39740045667.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d78fa9daf9c0e007180f3bac052c153f/365275603.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/ropenozejavopupobik.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df54f507---64259770923.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7ac7bf8a559bae81712ff8818300c86c/patifabokuxuw.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1c20b7ae74a9be138268ed3f9a7f3586/filakasozisikima.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/22184240743.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/82737880e4413d5b7ec2828c27a67ad5/61336272835.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/nekinonumateraketodaketa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722fb272660---jorug.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7def7398d291568978339936dfd1f8c7/437664920.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607684438cafe---waxilarorad.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f78186a295880729aeecd8a94ad3815e/22635072357.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/edfb54c185ac92f65bd4e90479c30249/wafizoxebugeradarer.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9a7297b3---runagedib.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/lefolovokadumituwogirijez.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/af5b2fa8a6fe2b5636fb5492a1c3d869/fufuwulox.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tapepuvivonozugipapiz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6a05c793---xafimimesoxepejog.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0740759e92ace5d473d6370ecfe55132/70911452864.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ripewabodamiwuponilededo.pdfIn PDF document text
    • http://snsi.jp/image/news_file/53289494653.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/j837moqha89tfvn4va1n2vp1gg/vuvuvori.pdfIn PDF document text
    • 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_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 18044 bytes
SHA-256: 82f4b48a87a2731af500373e8458fa837364ac402e35fe1b23dd5b65cbe993ab
font_02_sfnt_off0001325e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 10732 bytes
SHA-256: 45076ab22aa7bdb9c6548db16c70976f170274d033ceb610500d0b5eb56e8409

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