Malicious PDF — malware analysis report

Static analysis result for SHA-256 906e405502bbc560…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 15:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5860d9d87fe1d44e04e73ec879dc9d12 SHA-1: b5e268629a7b5cb14ff6b71b9ab6e9d8d5bd0977 SHA-256: 906e405502bbc560305f86edfc88977e1ceb6890f4a9de19537dccac733254fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b582dc7694183abfd2470a0f012ba818/nebozi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad64f90aef1---3089238123.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/50a069ca2ec569660db5c11c5fc23719/duligowufefiramugazedefez.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088671ada726---43626265363.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/52902299502.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e0a03d9f---2716547510.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7554656c5---90207276030.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/61954371715.pdf
    • https://beautyyaurient.com/editor_upload/file/86238436835.pdf
    • http://stark-tools.ru/images/uploaded/nemidawijogobivub.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/sunatedafaluvudapupivi.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285605d8ff---25636159420.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac622990ffb---zajosafumunikakikomapinub.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/af923c2efe7ada81487a8c2fbb57304a/dezokesirupobug.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/377c1c82223084bcdc97e7542029d748/sanebojel.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2i6c4latvn8o55u3s1jeh5mel7/52702390594.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+sister+wives+2020
    • 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_off0000eb32.bin
59db47ccf4fa1c6e3f6e9650b95ef3166a1094bd4e3161e9fa4086112f43c747		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 10168 bytes
font_01_sfnt_off0001023b.bin
deb1105a172ffa86211abef5348af1ec80e2c19e2d72e114fe2c7128ac602aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 17448 bytes
font_02_sfnt_off0001302a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 16792 bytes

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