Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d8b7acfca54370…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 07:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a102540809d7c2d995d79faf17f55827 SHA-1: a7b6fcddad4a411dd6d63019cf670dad2f637a0b SHA-256: 97d8b7acfca5437066c7991076fbaf79d536d3d990df86959ea1dbaed3294f1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to use disposable hosting for link distribution.

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 https://inwebjor.ru/uplcv?utm_term=ewbank+280+cascade+manual+carpet+shampooer+reviews PDF link annotation
    • https://businessservicesuk.com/userfiles/file/topazuxijirijigov.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gajinutuvurov.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17842587161.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e6024d33---48446827934.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/58152764926.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed4f8be95---58261907650.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/63d013o49fti53eohvt4e6d7qp/69950591539.pdfIn PDF document text
    • https://bselink.com/userfiles/file/zakug.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba4988881---tawasiwupelupodobiwig.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b9898c3f1---jinale.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/pujosaza.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/28284851200.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/58703503656.pdfIn PDF document text
    • http://888chji.com/userfiles/files/mipikopogefexatozajured.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7838d43bd0fcc0b3a539723cf70cbe25/61037144245.pdfIn PDF document text
    • https://aspirans.com/files/file/taxosuxumudiju.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/74159026172.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/53847893449.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/39e923b4c8d40f800d4bbc830a6da283/60571027943.pdfIn PDF document text
    • http://spharma.ua/files/file/95460594324.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/zekoxova.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/shu330pnhooel8td5rc9jda193/mezepi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jphhlthcjlm15ni1jsjvd58o2g/10632474958.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/2622753426.pdfIn PDF document text
    • 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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 11696 bytes
SHA-256: 934605ef8a45c152219265a15adddac0d5337bd7c8c9721b6916592078deee94
font_02_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 18128 bytes
SHA-256: 9be63f6c137c52fcde289a5de48d35cc3ef4df0428fc6e37bef79c4c3d7db966

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