Malicious PDF — malware analysis report

Static analysis result for SHA-256 605d16c16e5e1d3d…

MALICIOUS

PDF

87.5 KB Created: 2021-08-15 05:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54abe8147f43ca30667acf6882737b98 SHA-1: 77fe9c9c095f3a2da184149fa68277df9efdab95 SHA-256: 605d16c16e5e1d3d3c5ed420603a862c88d3be46c8592d3ff706c3301264c872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs, including one with a 'utm_term' parameter hinting at game-related lures, supports the attack pattern of using deceptive content to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c6bdfb554d8cab3180958681bab34858/87500515102.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab6a671ed---sepokejufalolut.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/kjcgnvqhv7vh9i2krds9fd8pj1/perinorimogo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083443b10242---98889398791.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/7029217839.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jtrimq1a3or2vh3rd4m43mnif7/13997962313.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d2c5b4d41---gavejasekitusuxabebofaxin.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/movuzi.pdfIn PDF document text
    • https://limsurdua.com/contents//files/jituxawabapepatenilevube.pdfIn PDF document text
    • http://kbchina.de/upload/5890447127.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xifititimepaxujize.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/xowiz.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/ruwatodape.pdfIn PDF document text
    • https://discoverthesky.it/file/63205718207.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e315d9e3b570da9b5b3b202de21f8b22/subaxukuwimabaxezero.pdfIn PDF document text
    • http://gistys.com/userfiles/file/guxiranemosavopamowaver.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4317761d65d1cddd7889090b196ecedd/99911717718.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jowaboxugoxozub.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/mimewoputu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161086b5407eba---48914068715.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/26964723548.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5600b323ea---lexoromiwof.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/konirix.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/f07v1olp5a6nsg6qjn23bnh7kb/69010292843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=is+five+nights+at+freddy%27s+free+on+pcPDF 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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 19248 bytes
SHA-256: 90be61c42de7e092a8c701ccfd2e1b855866ecbcb5adc7745a6d92956e37970a
font_02_sfnt_off0001363f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 11020 bytes
SHA-256: 9fd7f8244b54a461f3d86e2260de64daa9bccec144b798c1474ef1118082c7fa

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