Malicious PDF — malware analysis report

Static analysis result for SHA-256 5576aa4f2cd8eb51…

MALICIOUS

PDF

109.7 KB Created: 2021-06-29 06:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 755b29fd9c21e3751a7602290070872a SHA-1: 7d872077ddf2db1d1c98eadd4fd58f1fa4b9dcc5 SHA-256: 5576aa4f2cd8eb510180a64714af139629c84f2af4dba58e02f966eb884ffff1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://icltindia.in/userfiles/file/52492436942.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cf3b7474---voxewesipinirawogutez.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xukeritopogoj.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/11167798506.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609290f6ef1d7---31856189071.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0cd93818d435124414708bb76cf677d0/20925663027.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f4u0dbn4ojp6ddnaqfb9nnro73/13079898694.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba880bc2c77---fulunufu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/abac9144ae7cf0e30436dd22c2098a8f/8156490522.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6eacd9---xegurudowagazepul.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/58049754755.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e522c4a680---rugonenupatufelule.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/12910623367.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cm49tf4ql894n1djs5r2hb9p74/57284560723.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/kenelid.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nolijiw.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/56415821252.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/66d8722d349fcb7c381b5aa258dbc979/tojukakiwaloxodo.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/4pfuqhsg0dcp9bnkb3clcjrjts/84784882148.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e2aaf8bceb43b3bbc5c9c235658c917/jabavemopexoxir.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/99059819033.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/wesosazipelekoxawiser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mild+thrush+in+mouthPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9af6eba83e7ce46679f2c55511b322c6/rezazazotojinulefupanapob.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_off00014bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000163ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EF 10312 bytes
SHA-256: 09af4ceb63f0324631a67b9b37866260c8a8751f3de6dce4f52857c60ea9a69b
font_02_sfnt_off00017ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE3 18144 bytes
SHA-256: ce29fa7b7e0d00ed0fd0070ef0f7da25812abc65a692c3a32d20acada6b1a71b

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