Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c9678d85a3c02d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 18:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bb99e838493a3511cbb3ccc2975e441 SHA-1: a8bbbb003476b6d0c97e2ae9ca3a2fe73fa79829 SHA-256: 72c9678d85a3c02dbdf1c7055c911540829849d0c940d9823db4e39498b99aeb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various domains, many of which are hosted on potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide direct instructions, but the overall structure and heuristic firings suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fizevoxafutimaxamuxip.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c96133af3---tenixi.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/86136481076.pdfIn PDF document text
    • http://air-con.ru/upload/files/69908505624.pdfIn PDF document text
    • http://turnyras.lt/Files/file/49032400639.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/pefuvasasekufubedo.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/78632555511.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/sogubavevetuni.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/69334342034.pdfIn PDF document text
    • http://metabolit.ru/files/file/zogaberovojamusoka.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/3101435427.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/61211965618.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4aea4e23---tefolimude.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/57969778750.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/jategulubovirigewamupaf.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/78465491078.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/kafujag.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/vatibuviv.pdfIn PDF document text
    • https://parkettworld.com/upload/files/68863641797.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16136aea85d8b2---tomaruvofetasaxoxev.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xunupo.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/wowaraj.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/lomatidapov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=different+wavelengths+of+electromagnetic+spectrumPDF 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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16412 bytes
SHA-256: 205f64a3b0942cc1a12cb98fc56cb66c0ad9c49985c6cfac990af9aecf369aa1
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 11180 bytes
SHA-256: 39d5b4889e661baf93a3854b553e138223b78aa42b748e07c8aea4d454be8cc1
font_02_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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