Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8e7b8b1dada86a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 00:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a72bf0bae36a5387fa61deaec081ef1 SHA-1: 751c5884f6bbdc60879f723b5efc54853f408649 SHA-256: ba8e7b8b1dada86af11472686f1adc1bb2461b250a06e5d7fb6e28c926715e64
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of multiple external URIs and link farm characteristics suggests a phishing or redirection attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bukvoznaika.ru/ckfinder/userfiles/files/11229219754.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098455eb8bcd---lixosovemixine.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/c2hjm7l96guas8ovvg2j7foc57/lekedili.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/xiguximenelezonene.pdfIn PDF document text
    • http://megalaserasia.com/upload///xosiguwusuvasaxejuliv.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/52167747757.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/sagalem.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d99292ab1889e3c84cf6e70c490a488e/3934857717.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/juzujemopetigerenadak.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/28911707530.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97da4d6c2---nanuzuvenaritupizasize.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/9014669652.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3b0c39930---96112871856.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a1ce1df9---77419249232.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/92962137959.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d095cb701e---bonodigunujiferifalo.pdfIn PDF document text
    • https://dafelia.com/files/kekudekowa.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8a487a3ca44b3547ba4edee5b47df0a4/jejixasazenane.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210828/files/20210828022820.pdfIn PDF document text
    • http://synowka.pl/galeria/file/96750059857.pdfIn PDF document text
    • http://siembra.me/uploads/files/zezaropexedelogamotisesev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=qualitative+research+and+quantitative+research+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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 10968 bytes
SHA-256: cdebb0a59d4a302773d61b0f092b3a52916a0511181ec2118f89d4d258cb231b
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 17200 bytes
SHA-256: dc56e36185b571b32b819775fac05aaaf14a194795363684f60662bfdf448f88

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