Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fca2164c5ebe07…

MALICIOUS

PDF

71.1 KB Created: 2021-08-22 01:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 695f46c620cc1c747be2e15ec27143c8 SHA-1: 411cf30d40a506de583f39bb1572918be7b12bf2 SHA-256: f9fca2164c5ebe07d38e2412356e0abb471c3db18413af235df9312f0ea93995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d966eebd2---14078639301.pdf In PDF document text
    • http://sola-brothers.com/userfiles/file/vakum.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kuwamukir.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/777882380.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lubujoxirirelemafed.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/xolidijibo.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/48897827265.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/34260601681.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ef8551398ba4fbbcbd6670247c34aa33/27238987094.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ed5845989962e30cb52b411be8b2b61e/40772009136.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/29750625423.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/54877184812.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58b279902---gugoli.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b134b85f1---donabuzakupazuvejexi.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/38224409044.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be9d815cbe6207574783e444996b2e1d/wekizonujab.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4450ebfd1---7765890041.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f979c2a5da3---61597925748.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cde7f5834f16006b12814900f4c3669f/wijoluj.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/260322525277.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/64024836820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=florida+learners+permit+study+guide+quizletPDF 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_off0000b676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB676 15292 bytes
SHA-256: e04ad9c88b2a5ca7c7073cc8086de7efd6846cc49024ad56faade2e9e04aa949
font_01_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 11132 bytes
SHA-256: f02437cf3e8e221313f79ae35a327e0c91a85a2965828b723041a384448a820e

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