Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdd21ec89c6abe8…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 08:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4bdc97f084440cbcf0a9b021e87a1e0 SHA-1: cc8899683474173ad8bde4af94c7b8483b1aebef SHA-256: 4bdd21ec89c6abe81b32c8dd416a46daa01222d924d0bb89a74a7b06db1e3c58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://garglob.ru/uplcv?utm_term=what+does+psychology+fall+under
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u81c11ic7ttssskto00sgfges6/31152201049.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748c56e992f---12533349073.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e53b240b3---56290354207.pdf
    • https://harom.ro/files/file/76611906020.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6eda389a819d0e0c70eee31aa3d5124d/negafiw.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7vdlmf3f6sr7n0siktm6eh217s/nesojumip.pdf
    • http://nprofit.hk/userfiles/10454939187.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c357986350cc05b236d0eda64fdd350c/kedinageber.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ca2c61eee4ff1b0098627577dd6025ab/girevasifaki.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0083a264---rolaxifaxobepolepekoru.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ofshm0ngm6f4bshp1sahg0lg7o/telezitonolasuxeni.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ece5a77---gebafewepox.pdf
    • http://alexandraharris.com/clients/36054/File/2068062417.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/3858662332.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/733fcfa6b4e30fcaf597564f82d6462e/23202718619.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b5e95bec---83316059083.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cee96ffb0---79252645660.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/c2oec78lmt5crttkjr1arrkp1t/8131376221.pdf
    • http://aqbnb.com/uploadfile/file/53311791484.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/tadizelutajigokovori.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e7879b5fafe6d0073f24027d116c025f/jogagumositetosizotib.pdf
    • http://alliance-ltd.com/userfiles/gogize.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079031a747ae---fabuwubel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efff.bin
d20b354c2fda2da7199c348a76a2e5b7c9820833cd4d27e3a2a97fff379a424f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17388 bytes
font_01_sfnt_off00011db8.bin
7ac6c4026c429d261994246b9802a3174077b409ec89766dc96c15ad88197616
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 11012 bytes
font_02_sfnt_off00013728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 16792 bytes