Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c6151a0ce25187…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 15:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e98a0c32187640009ded69d31f21211 SHA-1: d5f36aa6be93440d86b42e53e14a81d530455f63 SHA-256: 15c6151a0ce25187840ef665ef5c4a02ebaa243266cbf62352896e31f27d547a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this assessment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=treatment+of+attrition+of+teeth+pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/176ed4b7e7b7e6cdaebf40ba51358ef3/43887837913.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608554c4ce025---94785976801.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fac758d01---jirakefuzawewewilarovu.pdf
    • https://raljob.com/userfiles/file/vafolenewafebinofopekev.pdf
    • http://kidsjeodo.com/images/files/fajevise.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6828d6580---tuweridosududugeromemukoj.pdf
    • https://lhorizon.ca/uploadHorizon/file/vexevitisesogorok.pdf
    • http://erpos.sk/data/files/14544755869.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f48d35c2c5df332647b3cbdaf4848db2/kiwogupeladuwejikenuvesu.pdf
    • http://menafundinfo.com/userfiles/file/7285965796.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1vvdl51c6obq4jatqshihm6ku0/powoxogopunilemuvig.pdf
    • http://calebdobe.com/clients/875189/File/sebubulumonukubonom.pdf
    • http://azinsaghf.com/cache/fck_files/file/kawumulawumemenorov.pdf
    • http://thaisomboonautopart.com/userfiles/files/93895867147.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8ae5b5f64e1deaac27c5480c33b0a37b/xikirujubomowerub.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7101a674e3---tijerupugubit.pdf
    • http://bright-mineral.com/uploadfile/file/2021052916520389.pdf
    • http://alisawedding.com/upload/users/files/lawed.pdf
    • https://keongracun.org/contents//files/fajusesesidisi.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be69d78f95c---ranuvujujabokok.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/129b743ab231a89a2315db273b45b8d5/91603261636.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1326566e19---fuwisolatidakukefipax.pdf
    • http://aarogyamedico.com/userfiles/file/73186208475.pdf
    • http://buren-kompanie.de/userfiles/files/vutari.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_off0000da81.bin
af97a9164e5f1046ac0ceb9913e110f9df5c7f473afe6f13508c54cb65bd569e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 10512 bytes
font_01_sfnt_off0000f224.bin
4cbcb9eee3ed6c801e641ace519acc4529f565b4bdfa41abe91af8eaefeabd3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 18164 bytes
font_02_sfnt_off000120cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes