Malicious PDF — malware analysis report

Static analysis result for SHA-256 16825cf83ee54651…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 09:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dc4fd601908e132d14c184d657ac0808 SHA-1: 6d26cf9aff9fce3f6ed64fc5e61bc9a4ba3e9215 SHA-256: 16825cf83ee5465190e6d3f4c2ced825e4baee180a5f0f7e0ba5c15e53c8d4ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://cortemadera.com/wysiwygfiles/file/xepatofereju.pdf In PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wifinilufazomanab.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/24820538029.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2cf76cc79---71061552795.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150413c99472---kanab.pdfIn PDF document text
    • https://n-tlg.com/files/file/pamix.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902195809.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/puzaxasejuwiranape.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210926104402.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee6ee524ec---27801378932.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/51362379937.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/fewulowoxoxodibaxibefiru.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gofibalujanusifibokigu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4f4b2780754ab5122cf497f99bfc24d2/kibufidufubekuzovasopak.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc7e38d9d4afa1af13c3c11f0e469e69/nenokokepojir.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f7baa27a3612692f887cf667bf117404/jefutesefinu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/lomimav.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/10561288129.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/genenojemiwapof.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/govapuxopevelaj.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/3295061658.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/19846392237.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161512277b10fd---26053653299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+secret+garden+pdf+free+downloadPDF 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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 16444 bytes
SHA-256: 872802fd2cf6479356a87e934e1a5d168947c85febc812b26a95d50eada8cc9b
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10896 bytes
SHA-256: 118477ff07229f5311194c9c4a406028f58fc6afb9c1ea08e9935239173ef4ab
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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