Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb81f35b0a4ae56…

MALICIOUS

PDF

120.6 KB Created: 2021-08-01 09:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a90269ec60b428aa312a52f50d26323 SHA-1: 6a38e49529069597f86574a1ad459674188c8047 SHA-256: beb81f35b0a4ae5602bf460c176c9a1bc93100e08a10af7d192e6d34418e3d07
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple compromised CMS upload links suggests an attempt to distribute malware or phishing content through these vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9g71nmub53jde2ium5gd7o4980/vilikujeb.pdf In PDF document text
    • http://naturallabs.fr/userfiles/file/34301052956.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe7bd7d1f1---45365101484.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/95c662ecad01343bc84463fa970088ee/47627129142.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/radiresikalimixute.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e645177a---84519221977.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab79493a---pavulagibimup.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78bb78dcb---gomodabosiregamipuwo.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/rexanebedib.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tetezovezinunololovu.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/dodogadozudajifesoredaki.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/99513469915.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4cbd9e1b8---wokogagudodusav.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/xesozeko.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3c54f4ef5eaa419cc4cff6b7cfed435e/19187590667.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e03963df1e043a079d69059149138bea/kideragilitodoworam.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/33726904485.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d120300a1345339bdbc781bf4c71ea87/kezekuxadivevowekawu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jn6jl6iori8n308a8a5t8nos02/muwevudizewalidigobuzev.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/juxanusavikikukuwarov.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/liwim.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079838cbdad2---57086299896.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160725c66b3574---70284342255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ottoman+empire+history+in+urdu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000141b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141B1 22548 bytes
SHA-256: f8baf9b8df818114e261a745f983870c47b6ae57a777735bbc62a28642efc2c5
font_01_sfnt_off0001694f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694F 23064 bytes
SHA-256: b09062dcc378a1ef7f79e2e3dae7bf9c12a3f859c9df8ea49f4ad23017b3afd5
font_02_sfnt_off0001a071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A071 10956 bytes
SHA-256: ad0413654a571ae43cfa5429584cedfd33f9d2bad96107b39ba29dedb27ea526
font_03_sfnt_off0001b9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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