Malicious PDF — malware analysis report

Static analysis result for SHA-256 341a43a7d19f348e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 23:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ecb6ccac79377c8f399327d3c52b07a SHA-1: e931e5bc611585f90927fa8469f5752ae0a52649 SHA-256: 341a43a7d19f348ea597b40b574f81bec3e8a2f8d946811cca727a20cc8345a5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://train-in-japan.com/images/blog/file/1206953177.pdf In PDF document text
    • http://abnig.friendship-match.com/upload/files/65071819259.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/70535037918.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/mokixelemezajukoxuluwuzim.pdfIn PDF document text
    • https://airxps.com/userfiles/files/77719514259.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/lefudo.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/29151737983.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/sokuvurogivel.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/32875707298.pdfIn PDF document text
    • http://schokofontaene.de/idata/69039691990.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631189331.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/rijigaselovenenumo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe9916f0c---76913261133.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cad324ad4ffb26f774a2fc2fb6e27219/25429468502.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fitexowovopisutefubezo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gbdbkt17er4e91cudmdlaidhk/72500240758.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/15865485491.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gelukujujuv.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/62301353896.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/lodefivenuwupumufoligixez.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/boduxabipetikagodateje.pdfIn PDF document text
    • https://iwistw.com/upload/files/serapudebe.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/fiwufijupokogo.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xagutixulavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=3+pandas+in+brazil+frivPDF 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_off0000cb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB79 19928 bytes
SHA-256: 4a0deb4364699f272e45c50f1f5c04c596bfcb08d39b4cafdbb77a93e7d2f11e
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 10480 bytes
SHA-256: 74516c2ee6c95f10bfbfc6279ff2597d568f13eebea4dc5a7ef71bbc7824cf27
font_02_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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