Malicious PDF — malware analysis report

Static analysis result for SHA-256 728ccfc924ace003…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 14:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa081f7001193cb4780e3a7d131026cc SHA-1: c9897cba7f19fad0ee4894fe021149e034f52862 SHA-256: 728ccfc924ace003da3594e3159686fabbe02df6d2d8a217102f78419b2660f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of a "free steam key" lure in one of the URLs indicates a phishing or credential harvesting attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and potential malware delivery conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cf2b5f4ab7a866bb0b992e2724f47a8d/8416291987.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a8fb7a4d---55993021757.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905192936.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/22512533002.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/94730736013.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/24270166306.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nemexisujifepa.pdfIn PDF document text
    • http://wsm.hk/images/files/30518523003.pdfIn PDF document text
    • https://okazionche.com/files/zejedowizesefetenesib.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/surelinatavenudoforej.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf20cabbb---gabufumadogipevenofa.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/89256202021.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/85115828872.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/41b98033e2ad512b7bca8a2ac980c3f6/220164982.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/71663204537.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/sivuvovinazogikuwo.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/16741090321.pdfIn PDF document text
    • https://ksuskalology.com/images/file/miwakumewog.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/juwusozufofegaket.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74077849796.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/6191192928.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/91324993933.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vofigebodakufetezo.pdfIn PDF document text
    • http://cloverdiamond.com/file/47256400035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+steam+key+2021PDF 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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10384 bytes
SHA-256: 8081ae05bdb46c97cbe24f4ef456c0df038f5fc026d5f2692106784357119474
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 17988 bytes
SHA-256: 763747d249edcf1742fa93787c55a0f460ac16e86815e5047f3f08eb3c0da199

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