Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1658ea50addf20…

MALICIOUS

PDF

108.3 KB Created: 2021-09-01 21:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: aa0f207a254a29c3ef83650b468b2523 SHA-1: 917eb8251bcb78b9aa9d254fa624b6c1a692b42d SHA-256: ee1658ea50addf200f6043076b86ea4ad43a33a44ca4ecb074e95ecc3f7c40d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://alternatifmedikal.com/img/userfiles/files/gujozifat.pdf In PDF document text
    • http://inglewoodreunion.com/clients/68690/File/wusaxafiba.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7el53d08ltdjjol70pg0bhudt4/94668855349.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/63666047375.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a727e7f0c11---rogufopokituwugixalomusu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b24c31a5556d3e35ffdcdd13ccf46b8e/41839383326.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd8354d13b---bajusutadesejo.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/raxaruwanixigerugora.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/53892812492.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vewasewexibixapi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/12394693816.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/54019580319.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nhqgih88e220ae9strgf73l648/mugawo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cf0f03b2618355d23d21c29613a8982b/8582776278.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/99436620080.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c7d51bac---19313733242.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/26253195932.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0e3e237f---noroguse.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/74132764983.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/52118253886.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/vijetavo.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210805031454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=galilee+meaning+in+hebrewPDF 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_off000145f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E07 17920 bytes
SHA-256: 3a3c5a36f247756fe0cfa97b07a0d30f3cac6ac4f569d5ee4c3889e2783ab904
font_02_sfnt_off00018c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C54 10436 bytes
SHA-256: 01cd009a57b9b09debd151f9f0926621d5592673bf97f1670d1cee3f0310a9e8

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