Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bbe188227977e4…

MALICIOUS

PDF

68.3 KB Created: 2021-10-03 08:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebc993f3d85ef1bfefeb271e78216fa1 SHA-1: a1b4d73b9047e0d3f673da0100e76ba167f38365 SHA-256: 87bbe188227977e488f541f6a42b0fa3ff398309bde14f64d980fbf37f018e23
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or suspicious websites, some hosted on disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malware or conduct phishing by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5f80728bb05ab67af94e5a4624df850a/dujavebiwapitukomezikut.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/75235924879.pdfIn PDF document text
    • http://rayanchem.com/d/files/85820203183.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/vepikake.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7a98b7fdc---runotem.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/42054274233.pdfIn PDF document text
    • https://people11people.gr/uploads/File/82111833658.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_115356.pdfIn PDF document text
    • http://woykoff.hu/upload/file/daporagopok.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/digovupowofusevo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336518719bf---6589016853.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/gofuferebasituwakegedewiz.pdfIn PDF document text
    • http://emaaravm.net/upload/files/15696978206.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3aa55dbmdr8tdefhnbnkg3lb3/ferawa.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/wirabilakogez.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/kevuroxewodupe.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/13587653452.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/rixokabafeguxogikuvimo.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/velezogafemokofisi.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/vixix.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/16803367314.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bedase.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59d37c2fd8711779b3299a0c8b1224b6/86540097130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=did+you+mean+googlePDF 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_off0000af19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF19 14840 bytes
SHA-256: 7e1a13ee36bcf83f3d5a61a34c8ad55fff34a790c8d8694da995e00fb7534b6b
font_01_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 10440 bytes
SHA-256: 3fd0cbfc3b102fc8a9c8c4b6aa7601ac53c2765516b812c901b53c55de59f115
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1