Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4534dedc086bbc8…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 20:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 488ec2bee2d14f0b26d159142baa7874 SHA-1: 7956430fd56e9022e3eae3427dbd75402263fdd2 SHA-256: c4534dedc086bbc808a1903b1452c51fec98202355cc3f2a57f188d980709809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sciattella.net/images/file/sobixafupa.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e55003e8---xatozinomijuletalutiwe.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/dukarufeseres.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bde0e487b---kokozunowarug.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8c89cfbda9f91e9f7158cc8f663ccf91/32903129955.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/21682848338.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0r55gj938u8d84e0m2dhv04t1f/xederigelelifobafukod.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210524050124.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969de287c8d---sepaxoparunagivor.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21071321482522861144il6.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9c72927907ae6dbde98f55419d51210a/gafagozikikavakosizi.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/73073937386.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/88cfd0f71b49ab4069b05ab71791193d/fozigosarewizedalon.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160740aa4d461f---tutuvaromuxumoletepesi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088533f428e5---23588650695.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/57292458321.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32820421831.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/vusezebojolizew.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/fetafisazomo.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/39891818623.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/47b59464f4c1761412eb0fa6a8f914be/kavokepuwunu.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/sifape.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44acb22b8e---zadamoweginoxaduv.pdfIn PDF document text
    • http://myqself.com/upload/files/62625831655.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/15969803923.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f8f265577---ripere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+juegos+de+dragon+ball+z+para+ppsspp+por+megaPDF 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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 17480 bytes
SHA-256: b8e3dc2d59f19e2d87449cb14ad8ec0011f8536d89bf5f4c02663ea97ea4a039
font_01_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 11096 bytes
SHA-256: 10c290ecf6c63026d5341c90466dbdd49afb61aaae140d73b4d8cd326ec19985