Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0c2b19f254ffc0…

MALICIOUS

PDF

92.3 KB Created: 2021-07-09 15:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 553668fed894e3b112c4b7a5a561739e SHA-1: 74c3e599a33f2e9f46c59477eff39c6cd276ec52 SHA-256: bc0c2b19f254ffc01d2942226dde5c4bb9d37392e6f47b4e7c239ccf60f409c9
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. This suggests an attempt to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mobilesamara.com/img/files/file/zadomutezex.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40db9f153e---xiruvogumanewoxizuj.pdf
    • http://www.addvanceo.info/userfiles/files/remogibik.pdf
    • https://harkakotony.hu/UserFiles/file/45534997706.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k2nnj54s6s5559e37o155r7f1v/winorarelopuv.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/311ee565c0d7e8215a89976d5cc6d748/51800439417.pdf
    • https://ikitellirezistans.com/upload/files/13795933974.pdf
    • http://giga.sk/storage/file/88155306896.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb4f5baa02---sixuniberigofamarus.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289b260c7d---92801061930.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c26huhhvtfdh06dkjvqfaavvb0/vibobujipibibakegez.pdf
    • http://antifftech.com/uploadfile/file///2021050203513151.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/tijupogejonufuwitusosudaz.pdf
    • http://immobiliareborghi.com/userfiles/files/butesoruletenolanututulix.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ca2e4aa9bd98dad6fcdddd3d31d90732/rovivefateminiweson.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d222d3881ac---76055006105.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/rajetupazupa.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3f7ad213---bewovo.pdf
    • http://asesorgubernamental.com/images/file/79583555318.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36f55d7f0---fekinimototigemovikeja.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/00280ade1eb4519363c79fd3d503de7a/88720970371.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ncert+solutions+for+class+9+maths+chapter+2+exercise+2.4+question+2
    • 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_off00010019.bin
6630594cb4d3e6480550dd2a2a3913e4729a0dd19b03e3d3c5d02ec867c49597
pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 17580 bytes
font_01_sfnt_off00012e2f.bin
b5199cbd7188badfebca75ffa95b302483f0b2d72fe71fbcd5b9e4430dc0084d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 11504 bytes
font_02_sfnt_off0001495c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1495C 16792 bytes