Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f9659c34850ca2…

MALICIOUS

PDF

91.9 KB Created: 2021-08-02 06:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75311140cbdab3c8b46434317c5e6c54 SHA-1: 4cc5f3ddbe16f8093f828b09e83d847c47c4e1f7 SHA-256: b9f9659c34850ca2527eb3974d4835c7e6f6889fec78deb5872b8f4d1c3748ee
204 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'SE_CLICKFIX' heuristic indicates the document likely employs social engineering to prompt the user to execute a command, a common tactic for delivering secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ef48f62d362a3b6e35d626e56ae93e3c/najagod.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/55531291114.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sasawuxifuda.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/2873093029.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a246c0ab7e3---faserobinodafofesaf.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/bironoxum.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/wufidedipagoguruvit.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4b4t4b2ri3f0dhef4jarhdsvvh/60270095708.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/30014064820.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/64880597103.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/91410983192.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5a583026974a7f70c49a3d92aeaac227/petetosumuvarodolomit.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/93lblft5qbeesgsrf1r98j52q1/79329521765.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/85459535998.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a87ad2dc---seludujulapivurek.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/nawovevirimuzu.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/rifamizu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/40625855031.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d312b850---58374370322.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2ie1psbtof6g9aoriraelf4nit/zuvapaw.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/34988348206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=windows+8.1+pro+build+9600+permanent+activation+keyPDF 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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 18832 bytes
SHA-256: 454e0e2f5e2c5f9563559723ae74903cc534ca6b17d6689a104a25f22e6caf3a
font_01_sfnt_off00012d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001451f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451F 12052 bytes
SHA-256: 57ecc96740c1e487e330dcb0e94aa7f13ae9b1e3f0e2d444e05950e33ef31b72

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