Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b4cdefabeaeea3…

MALICIOUS

PDF

84.4 KB Created: 2021-08-16 08:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac2899adce39e92321111507d96ff21f SHA-1: c551ae7b0d2e1a2af64eb609841de2d0e6d2c25b SHA-256: a4b4cdefabeaeea320f6c269ca1451a28f36f50b416eb23dff824f1676e46617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of `utm_term` parameters in some URLs indicates a potential phishing or SEO manipulation attempt to drive traffic to malicious destinations. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://huntic.ru/uplcv?utm_term=pokemon+glazed+reborn+free+download
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/gric1r8rfvg450diel0lbqf8vh/mipigipifopudatidopesid.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/galarawijapasopize.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0e6422bb4455c4d4b4501152d360841d/19441051007.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ut4e13hnvr3c2bpvh8lvojd1p7/86875858762.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b240d106f---wezug.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/43a85b09711edf2ab995731864e21476/14839673386.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e228e732f0---mijafopesego.pdf
    • https://vadihosting.com/calisma2/files/uploads/fidipo.pdf
    • https://chung-pei.com/userfiles/file/moduna.pdf
    • http://batterseataxi.com/survey/userfiles/files/94331936820.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/dusebozademixikapeporalin.pdf
    • http://bukharaatlanta.com/sites/default/files/file/67426593987.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/156be73a7e5ddec9e7accda6985091ea/92410771104.pdf
    • http://nextgt.eu/uploads/file/86395939258.pdf
    • https://egf.tw/test2/images/file/tezusevovasugatefana.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/23kni14tkhk6qf7750un4og2kk/kedadakunokusejazo.pdf
    • https://tisuputih.com/contents//files/basotobetulajuzejem.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/69395753042.pdf
    • https://thinkhigh-tech.com/d/files/6362680651.pdf
    • http://efuturesthai.com/uploads/files/katadafogaxeroxeresijado.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/73f2c779c9b89092c2bae1a240261bca/bixozo.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075f10455b5b---41232683687.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096377ddef01---fupujatonozodemus.pdf
    • http://swotaweb.org/img/upload/file/86056126643.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161039a71e4602---pojemujovabupe.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/709ca8f2606088a02c7e0593e76d6e98/zakileda.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e460.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
font_01_sfnt_off0000fc72.bin
e20128407d4c50ff342c8109c37bebb6622e115ba86b327604094b1d454f7eb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 18180 bytes
font_02_sfnt_off00012ae4.bin
9c8370b4c3532cbd89d9cda53e9257abae8a046346f3a2be7836066ebaf440f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 10716 bytes