Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62eeb033134942e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 04:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 820613f5a9e40daf7786ada884396a02 SHA-1: 750a25d306b90565c47ca42a402e035c1ef2753b SHA-256: c62eeb033134942ec5c14208a01fff7d1f09cee7f482997cf122da8b0f086652
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. While no scripts were extracted, the structure and numerous external links suggest it is designed to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/28966257398.pdf In PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/mivibadesuja.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608764079bdad---ragutijeveviba.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611912eaaa8ba---85418678282.pdfIn PDF document text
    • https://cristalensi.com/public/File/98757770622.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/fojunekitamutozi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607293c197db8---31092943828.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/87640914924.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/vojapugusesadi.pdfIn PDF document text
    • https://longhoang.vn/upload/files/68813011894.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dader.pdfIn PDF document text
    • http://kco.su/userfiles/file/85399231177.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3954991823.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/goladumidudilavabetadoxi.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/41521615375.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e60e7914d97760f31deeb8644f8c048/wumiguwa.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/477c46ad7a382a5e2d6e84fe5a762aed/lipefuzupobogijaxife.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad216dde1---bixituvume.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/43541093131.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jikegibenavanisur.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/gunubuka.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160869e87791a9---tevibaseluxogisot.pdfIn PDF document text
    • http://boldogelet.hu/media/wozebemunidiposeref.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/56e7789f7f080af195c9a3468559af1b/59850559584.pdfIn PDF document text
    • http://mfahk.com/upload/files/24897456224.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/q2norlrp561cau85dh5pah95id/20786136999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=electrolux+vacuum+repair+manualPDF 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 10616 bytes
SHA-256: 4b95642b9ab3c966f00d37588f713f2541c264ee176d2d18d3267b2ef9505dc7
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16256 bytes
SHA-256: 3751b90d36bc2b6fa23b30db540373c726e99c3dff46ed4551ebaaad436dcc00
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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