Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee657a20bc8a0df5…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 11:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e400c60b0df709e95e71f54f93bef296 SHA-1: a43f68f3ac94e972e480590be2034a58466f2e58 SHA-256: ee657a20bc8a0df5789fadd299397e450423a8730aee3272aa202946ec911fd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a349fe3f2f---taselovunoguvisefas.pdf In PDF document text
    • http://daiichihr.com/uploads/news_file/woxojosuzasefugewixe.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/62574429218.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454fe85e442---27096535818.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/24838939649.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/xeloribedazimejimib.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/78690555544.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/fugezelabokavab.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630787534.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/dikazaxevaxisober.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/71550908808.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/17969406840.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/xikag.pdfIn PDF document text
    • http://edeins.com/userfiles/file/ligifufeso.pdfIn PDF document text
    • https://semut73.com/contents/files/tazomo.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/73931184901.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gaxevojidalatoma.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/76457251711.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/viximupupopetizuluv.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7407f3734b25f7bd5cf47126e62920fb/89820481970.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/xofosofovomaw.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/31910449564.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/98866574166.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad15003c2b---40428642270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=real+gta+v+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 18196 bytes
SHA-256: 7b57e58a0431cbcc7ddc8c9d86480fccfc1a5dba0ca65e748297b8864e75c01f
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 10496 bytes
SHA-256: 1d3d344a27d48e8c89d1e19e5f108ee92a8c957175875b7459f58a4bcd2df1a1

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