Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87a994e4899c36f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 09:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c846af55b2e66e45c83dd40601c3601a SHA-1: fe74c0ff72f992f7fd1a37033dc66066b3de842f SHA-256: a87a994e4899c36fc3b4412adb3d577cd1f58384621609a10cbead625136bed5
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of multiple links pointing to various domains, some of which are identified as compromised CMS uploads or part of a link farm, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://phutungvespaco.com/luutru/files/femilazonibawabor.pdf In PDF document text
    • http://moreit.ch/productinfo/file/juwetusu.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/kemujixavogasesuzajozuwe.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98853822117.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf24e05242---sirolosorixezufutifowofo.pdfIn PDF document text
    • http://plise.org/userfiles/file/26892408381.pdfIn PDF document text
    • http://4bx.pl/public/file/28188929338.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2f2f301121d00e55628f7b542bfc2804/85953885666.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/60946963470.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/83057896291.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210526113610610149vvgsdo.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/12553159795.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d51af050---78589245694.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/69936296449.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/95366822841.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/pekiretogegiliwufapukolur.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e35fefcc9---bujakanugotegepalomi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af759787b---96462018267.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-9/20210809064922759064.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b9ba4d499e0accd152801b4dfc7b9aa8/bidixapuduk.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/donevomavidobabiweni.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/16717056654.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5a347dee37d2885b3722b77ffab9f208/rikej.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ch3d87sjjaj4o2vas03t7h6r0r/sirigidilumoleteditivugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=yogic+breathing+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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16780 bytes
SHA-256: 97b604bbce81c5187faa724003648e1a893e32e2bd050563f2f658d570e54782
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 10808 bytes
SHA-256: 1bea67b8a982564a2e95821e7d1112f4457a78f16f8c2683050bba906288917f

Open this report in the interactive analyzer, or submit your own file for analysis.