Malicious PDF — malware analysis report

Static analysis result for SHA-256 155fb3448ab700bf…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 20:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 87034e5019ad19f371845bf701586ada SHA-1: a0ccc7a785a3fbd3eb3fccac4d172a4304b2c674 SHA-256: 155fb3448ab700bf71764f0bed13e587820c905c035d6fd926c0dda86df7c969
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://megatex-plast.ru/pub/file/2029468750.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/gopivamugezopawuji.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/penalajij.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612775e46442e---92972438042.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210721082250.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f311b0bae4407dfc0fb5087c91d9bb23/lejateza.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46214827363.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/155834f348324f87f837d3a0cde9720a/lujorepexenutuz.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ae29058d778---98361699478.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/wutuzebejovupajitojalo.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/95230912106.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161096dc3db005---tesufiretiwomopuxew.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/sopogobudanojaraz.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/04f304eadd5d6fa59ee3b35138297613/93091871465.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fc1d1b3731b5d28315c3ebc4daeb5465/85866940700.pdfIn PDF document text
    • http://faradbox.pl/files/file/71790046016.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/kidubud.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/jesivukubadukarisitof.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741bae62f53---82593587590.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/14215155324.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/92158711066.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/13791732876.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nidesiw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wirarovolerazug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=progressive+muscle+relaxation+cci+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 18036 bytes
SHA-256: cb8af43c8075b3d5c3d5f8ebf2776a8bb76bd679ae86d6f432fd465e1c0806ff
font_01_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001417c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417C 11232 bytes
SHA-256: a2d570a680429260190ffa00bc99f6811e783710e58392853ce3e97da11a16b5

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