Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dd05236b6c884a…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 10:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f493f3ec8f168057c9857f76877f664 SHA-1: 0dd3f5fd3089d6f59f1ffcd1163d5ace47679476 SHA-256: 58dd05236b6c884a686a8746651cf2c479ed9620354793dc4552311699503d6a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the PDF structure suggest it may exploit vulnerabilities or lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://ccskin.com/geektic/files/tanukijokoweniberenobi.pdf
    • http://danieldesignpro.com/userfiles/92654228691.pdf
    • http://songiadahoaian.com/upload/ck/files/surizexetuzunotesiwe.pdf
    • https://farmacieitaliane.com/documenti/file/povufukavugesumo.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a64807cd728eada29ff63c6e6b6b2fa9/93035499811.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9290872c3a3b8a2da2a91d0447521fd0/86273296083.pdf
    • https://cowichanmusicfestival.com/userfiles/file/dolezonojelalogorofemiko.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/469f40ec27bad3327f9fd8d5543975bf/5567735508.pdf
    • http://carlaschroyen.com/content_docs/lovibanenowovusijo.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68roa9h1prmt6mei4srq1p34dc/sovomemonubuzadojafon.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14799a636c09d5a89829f26f06d3c640/dujesifudova.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0bpbraei2erjlb5qitmmiues1d/tufawibi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092526987fcb---nulamiwokarovodakonopobu.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5c7e3deb---boruz.pdf
    • http://e-hematologica.com/users//file/labigijafunaxir.pdf
    • https://apsco.ly/userfiles/files/10004482580.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e78701715---80861617299.pdf
    • https://medarbindia.org/ckfinder/userfiles/files/27033610895.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/43216692976.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c51066d4---rafumesugixixibu.pdf
    • http://www.tokyomagic.jp/images/library/File/mebedud.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076215fc17ec---60703191231.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=color+personality+test+white
    • 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_off0000df2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 16792 bytes
font_01_sfnt_off0000f740.bin
034420284c68ec281f2f1e2dfe0ee2adeb81e0b4ac24bcac5555866736cbd7fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 16456 bytes
font_02_sfnt_off000121f4.bin
e2211e1830a100f32d83e7d8d71b111d861afd551ffe285ebecdf0ee50788f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 10580 bytes