Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7d663f39211cc7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 12:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a461609a395029b8c1fe43a60c58e0a2 SHA-1: 7af615c2094d866e735d4aec9c2180f6632101d7 SHA-256: fe7d663f39211cc778ec2ae718294a1b1e96d9c2b4e679db463a87d17bb7c846
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://thaihotelsale.com/FileData/ckfinder/files/20210901_7DE2F5205DCE00C8.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc4ee676d2---medewazolofizimeziselepo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8abb3b8f---54257072961.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/46288013641.pdfIn PDF document text
    • http://dd-eng.com/files/files/zetutumaxusutenavudufuj.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/13347799624.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/guwusirexejudefilijomiva.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/37114726220.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210914150718.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109172108455019.pdfIn PDF document text
    • http://hainfelderteich.at/jarefe.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/vowerukulowox.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xidobiga.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/tezovutinovop.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/xepefi.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/53147517138.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/kakiseluwakedig.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/zojimozuwitakifevajaro.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/rowototefedewikolurotaru.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/timiwu.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/42411775566.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/16687376545.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/jizifapekagepizumej.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/tapirokufakuko.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/57a7bae72dbb63dd7b6b9ca187d0cf82/20045616471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+win+friends+and+influence+people+free+ebookPDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 18088 bytes
SHA-256: 0d9536e6a50ab425486ed9d2beec1e9f44ba0bcd70c672bb2af6703ec15fb7d9
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 11024 bytes
SHA-256: d2271fdaf0d2fa6f60f14285f502fe17cf148fcd3032b5c4cb5900436432283c

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