Malicious PDF — malware analysis report

Static analysis result for SHA-256 af298aee4e180efa…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 10:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6b324f744de9a14db65392253e39de4 SHA-1: 7565ce0917a33888559de8b7e6e030a9069fb014 SHA-256: af298aee4e180efa21b867d43d1e535605dd1a135dfc6bbab7420bd5567f3186
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=malayalam+channel+live+streaming PDF link annotation
    • http://vhshf.de/File/60181206975.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/jorobi.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/virefar.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/91168477380.pdfIn PDF document text
    • http://stattus.com/assets/file/50422588855.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dujomazen.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/37248185619.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/6566449019.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/88899388941.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kakitoreloterituradig.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/31231300673.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/jomug.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/32896062127.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c3e43868cd21e42e386035c12027bb30/zofabatanakafimo.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gadarasukimiganevejamili.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/viwasakekamiwozezuviz.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67629115564.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109100851216673.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/52941548244.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47560376633.pdfIn PDF document text
    • https://bagstyle.uz/images/file/35190072738.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/20271877831.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d798f3---84487135297.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72a6e9f39b9ff972f486e0b2163ecbc3/68080557358.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/95625162408.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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 17476 bytes
SHA-256: 462313b94868d8c11adb860fd2bb29e501009a18e50f27a5f2fc7f7a930ef5a0
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10728 bytes
SHA-256: 03abb9a826bfa72d4dead8f4410c0c12fe9481d216dc5edac36d4a756b278d75
font_02_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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