Malicious PDF — malware analysis report

Static analysis result for SHA-256 434be5c95039ada4…

MALICIOUS

PDF

109.7 KB Created: 2021-09-01 16:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9edcf56b6e5617ebf211cfa95a492efe SHA-1: d681e4f43b7238e31d21add39ce2f5bbc56a5956 SHA-256: 434be5c95039ada4c412988f38937e036f34692c22d03cc557d73ee2f5edcde5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=superman+and+zod PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rnumd2k6q2kidk80al5k4sobvu/zakedujunubowigadamaxu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/59778193847.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/89077752763.pdfIn PDF document text
    • https://argumentua.com/i/file/badopemelutarizuwa.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/11960808241.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/zikizikelutukejofoni.pdfIn PDF document text
    • https://angkalaris.com/contents//files/fezogud.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/12944976824.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/litelelurugazogojurusirat.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/d3i4iijq9ffmehtllg1tbd6v4l/jajaxupubebalifukijozediz.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/tuxiduziramojaret.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210825161648_1835554937.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jaremolugurupupekorupubu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ccb584d846626f6058720127331122a9/nagirekonodigatilogidelex.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/13381695038.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/48939160361.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2accccb506653dbadeca60da96bce19b/sibolidekodofogakukutis.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108231858129645.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/gibubukututelojora.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hsi04ovddcg9n1u5pk10pj6910/linalebavumuwexevinu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baab33d015b---41334433760.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610948c4eb4e4---69460694270.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b32f945d9---13505188912.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/totano.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_off00014935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14935 10384 bytes
SHA-256: 38439a96c86c79fae0b7cf2da94be6dadb79837a919b32e9fd50983a4a0343e4
font_01_sfnt_off000160ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AB 18560 bytes
SHA-256: 511298d66c5d76abc5acb1d61e6277e76798ea48b2fbc2139c87be612c61d6f4
font_02_sfnt_off000190b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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