Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ac8d303ed8366b…

MALICIOUS

PDF

148.8 KB Created: 2021-07-28 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e6b44271398d36296adfaf0174f0ac7e SHA-1: 08541921de9735950fe5d221be704f891682ac05 SHA-256: 93ac8d303ed8366b9ff147e2d19e3519e1453755afa5ed595e0eee441f36d6eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving the redirection of users to malicious payloads hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/829139337.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1a6ba170---63348905850.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f0484a63---66256688162.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/foparixutaridu.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/bifogamonuxakijajaluk.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2643fadb95eb799a4cd291f0b17d1b2b/fijavavexuxusukutik.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/zanurub.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zowalowowuwagurotaxegoj.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/98259242193.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/53485074365.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/qonrmnnvgigbj8s1n02g1cbten/wazirebolesumajuzode.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8aa03398d---79784959621.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7c0jncm3kp6788hrrdq94h6hl3/77465910622.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210718_82A69C314A1477E3.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/53582633680.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/af9a162f1b2119a8d6548b94d4582a18/44000267163.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1966a5576---zidexeboravojazomilaz.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/fiwaparonigajiv.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/t32lqkbmb9vg8l6p481mifhkhs/84502602958.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/999b521441ca0aa46bff399512439cd7/70713122922.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15e98502a---74580761762.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec6552a85---pigub.pdfIn PDF document text
    • https://en.wikipedia.oIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=medical+prefixes+suffixes+and+root+words+pdfPDF 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_off0001d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB26 10892 bytes
SHA-256: 9ad1741a9e7509b98f1a8d3979550ac005d87a4c8dd188c287f2f734ff39c170
font_02_sfnt_off00020485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20485 29740 bytes
SHA-256: 397ff3d2898efd78060bb1dd3aaa6f0f9d1a10668219e87bdb760c1ab067e846

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