Malicious PDF — malware analysis report

Static analysis result for SHA-256 481ce5688747e4e0…

MALICIOUS

PDF

126.2 KB Created: 2021-09-03 08:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7edbeb2d8a678b52869a66106b7d0d9 SHA-1: 3b15d52323f5d085a060fe3bb4e02ff7b3e40c37 SHA-256: 481ce5688747e4e0d29a803f1981d29179100920c4c3c99849b57c1973acc9f8
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of a 'Download Now' lure further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aarogyamedico.com/userfiles/file/kugawawutoxopiba.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdd68d075---nenogogobajabimom.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee44c502b6b---27479233975.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3028270d71---zodakujako.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/38760365104.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/u7l14io93hgnd9ck1sjbqi1ot5/senabifela.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ele7u353kj1jgsmtv48c5m7df3/60209751324.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0acfa2b9fa---dalarevi.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/26550523381.pdfIn PDF document text
    • http://skupka54.ru/upload/m/pejikuwilagitufanurepone.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/88674562024.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/galezubadugevu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1654cf10---mazolejamo.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/24833314184.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/tiputifumefenasovewune.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/88085725624.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108081933387432.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a74f72dc707---42826346148.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d9a6bdbbe13a564ab89c259be78cef41/85572875666.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/73009644809.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd789bf0b---24649883674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=upsc+geology+notes+pdfPDF 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_off000188d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D2 18916 bytes
SHA-256: 56776c7e4655637302c2418bcd99c69bc22c8be8ae425976f1f2eda9c5b3d4c7
font_01_sfnt_off0001ba7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D296 10560 bytes
SHA-256: 1947e529a26a93a7872b8254a35911413688df52101bbf42980c20eb60a38cfe

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