Malicious PDF — malware analysis report

Static analysis result for SHA-256 77955527acef6a7d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 18:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe8b326ec5b96a8319a509643593b3ba SHA-1: c3fe799ed33393bd94d3b8b69734d4f8136b2920 SHA-256: 77955527acef6a7d18a5755fcfde2ab7aab724bd97c27534d5a9897add26434f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e35e35d084743688a9b4c0b1902f820e/25413595345.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3b87025a0514d654278c707ccb737901/gubososunozuzurikegu.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/caf84df81e27ba5c2514b0661f6c6d87/35782372376.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609085a9a2692---foritivobolazuluduruwi.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088336fb00e0---91875444823.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f1bfd0b42---12484874833.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b0f88891ce732fe5585b12dc8097a2b3/pisodalunukexes.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1bd65fe9e---49484376217.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a91a4ad7ce1af7d988154cc8a8384f99/bivivuzabukuxab.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94ecd8d85---texugavajamaralirezupa.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea99d2b8f8---35562214822.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160920e6d9b37b---88277463202.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rewovibirura.pdf
    • http://yangpupark.com/uploadfile/files/21539998758.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ac701764ea4---4780275693.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c984df02---xojobipewusubefibe.pdf
    • http://csc021.com/userfiles/file/20210624200208_geinu2.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160744821b65ec---92802124675.pdf
    • http://geteffective.biz/uploadfiles/file/jozusakidugav.pdf
    • http://nadiadsa.org/userfiles/file/babivevimemugodud.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a70a6b2d2481943a8a7ae7397b152f59/15241630536.pdf
    • http://decamiones.com/userfiles/file/nesamefuzoju.pdf
    • https://parc-hotel.info/file/44225384872.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/035bc660d6f69b9c62b46115c5130611/kuxoperunew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=iq+144+meaning
    • 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_off0000fc04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 16792 bytes
font_01_sfnt_off00011416.bin
cb198ef4ed1667afb1e63b4315ea50e2b090b8ed7746399168dd4ffa0d5fc90f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 17176 bytes
font_02_sfnt_off00014132.bin
615a39ddfa497ae5d71ad38813af22eac1d34022624471ade7b7759564f0d794
pdf-font-stream PDF embedded font (sfnt) at offset 0x14132 10148 bytes