Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6996626a137b47…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 12:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a0472b573a164700dd5c620d5022c39 SHA-1: 0f90b3f62dd0bc4764659850fa12340612d24a4d SHA-256: db6996626a137b4749b9891a0c26d9b655695beccc4936f213cf791a48bc26dd
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a browser extension installation lure. The embedded URLs suggest a link farm hosted on compromised or disposable domains, likely serving as a distribution point for further malicious content. No scripts were extracted, but the overall pattern points to social engineering to trick users into executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=best+ad+free+browser+android PDF link annotation
    • https://candica.pl/ckfinder/userfiles/files/51541017162.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/naxapugapalurekodid.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1039cbc34195cd3b1350095a86a00a89/72383400116.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///dogaxamimawajoke.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/nadedigevoromoka.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/55907233358.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614541f767a61---94413071445.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/wulikoli.pdfIn PDF document text
    • https://mauspro.net/upload/files/43767817710.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/78295717002.pdfIn PDF document text
    • http://kyea.org/imageuploads/kavewo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/51008224434.pdfIn PDF document text
    • https://slide-bearing.com/d/files/83452790895.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169f2136d3---resemewotigunapu.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/pibak.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/pogadife.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/wanugeradojomukalajorob.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e456b6cb11---90937451223.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb5ba59f6---19204182020.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210917111401107126fjkzzda3i9x0.pdfIn PDF document text
    • http://change4best.ru/upload/file/namemukuwiwugukaxa.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/1599785817.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/83108859974.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_32B3F4B56084F73B.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/67236908768.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/xibobirasugaralefugifil.pdfIn PDF document text
    • 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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 10580 bytes
SHA-256: 0783ecddd0fd4fe30d273718d3fc348b2448d046be468b107e703a3c39b170c0
font_02_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 17196 bytes
SHA-256: c44a9d420db7cdad8d7a0eae8588a50773f2adfd457b0f0a9fcda157f1db3da8

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