Malicious PDF — malware analysis report

Static analysis result for SHA-256 c269d22ac082f4d3…

MALICIOUS

PDF

81.0 KB Created: 2021-08-25 09:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32b59b3fcc7ce3b5bc9ae52fe32bbad5 SHA-1: 33c04fec4d8d84c348268f091185e6045c04b515 SHA-256: c269d22ac082f4d38a474a2829a58381a31db390f69f06cfa8b0a2f0ecba3f1b
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded JavaScript and external links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=thermochemistry+and+hess%27s+law+lab PDF link annotation
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0cc80598ca8ec8faeb365a63f68ae9da/32018069365.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/5241795469.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad61265a91---jaramaf.pdfIn PDF document text
    • http://huiking.cn/uploads/file/191224051512.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/83267694187.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/fawixaperakatinale.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd66d0077---xisetup.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gufixiwuxutitomolabepa.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4239500820.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jigud.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/kimizuxugiritugavawetad.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/18174232397.pdfIn PDF document text
    • https://designclarf.it/file/64465467596.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/nufozopebotinaganom.pdfIn PDF document text
    • http://lovesenergy.com/file/87149418233.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/57900347277.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/bofikexumizotelojuwuzuju.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/8979004188.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da7f747890e---godebijebejunalumiju.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42191778655.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ac28df12981bae7fce8b6050bfe2d2bf/mofezanowizeburi.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/vevuz.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/tetazobiwabolapasid.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10972 bytes
SHA-256: 03ef227528d4a90f34db443a7797ece7b2ba0e68bda4690c909055f447149345
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16572 bytes
SHA-256: 6eea47641a2b3387ed1f0ed915f4281eb24298ab6fe0ba37f9f299921b4a0f89