Malicious PDF — malware analysis report

Static analysis result for SHA-256 525aba4b14e7bbb7…

MALICIOUS

PDF

98.9 KB Created: 2021-09-08 06:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 531872d1f8fa32a6607037ee2c881946 SHA-1: 0bc4d9789262ddcb31e418567eb46414e2c6a1fc SHA-256: 525aba4b14e7bbb75a1e543cd9660ff9d1fffb64271f8f262abdd8425dbbd25c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/vowujulibiganubevurupas.pdf In PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/maxepiro.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/gusazodujadiwafad.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/70328403097.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/57662954954.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lepawibajoteke.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d0ccf173---57538704912.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wigewewogibofepebabigupav.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03ceaf87a7af644a6e97301de013dde2/lunupejizoxikudexavimirig.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/85167670.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00dba19971---sutofefibazufuw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/baratoxoxojazajiximoteg.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/7b8aa9f455e85218eedebadb8e8cc590/69670679245.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/kanotaduvuxaxoso.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/bugakevogifesar.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6bfd49b4f42d0c0383c12813151d1e75/83909455844.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/molopitegumusofabi.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/57400971409.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/saxunajagomixibodidag.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/26660213835.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/v300q0t5htrrtm8upku6e4iso0/28242302258.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/90666639530.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/140742445206.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/15905651150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=factors+influencing+prosocial+behaviour+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 11180 bytes
SHA-256: 944575cadecab39f70b58e1db710917cba247ea9ec608d2a5a1328048c894e37
font_01_sfnt_off000136d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D8 18024 bytes
SHA-256: 59b1f6528266b3acec5b0f4de4eaa9b23c650c8f516c9453509161f6cf8ba81e
font_02_sfnt_off00016590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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