Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e09f2bf92a121cf…

MALICIOUS

PDF

74.2 KB Created: 2021-07-06 21:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1f9825dd14272544c591b548eb9ce25 SHA-1: cfd26d3e6d42550c6e2f02f85b761699eb6f0110 SHA-256: 4e09f2bf92a121cf54368ff1e36e0f0bf615c571602e9c60d1892b5af9193e3c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or lead users to phishing pages. The presence of numerous external URIs and compromised CMS upload links indicates a distribution mechanism for malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gehr4blods6d2r42eeul713bc0/24353118818.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/3400b3322ea87ad603835277dce5a77c/30892267512.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7009d855---3254689417.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd95721b8f---rexevoma.pdf
    • http://giftboxvietthuy.com/upload/ck/files/60479315936.pdf
    • http://naucseto.cz/storage/35913797838.pdf
    • http://placc.info/up_image/kojareredo.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c38fb5a089f---punojulitudipazivadubej.pdf
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/wazaxezopokax.pdf
    • http://bioscipublisher.com/files/upfiles/file/17321738682.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51e5daf0b---28094473468.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b603e8a127c---mazenukiravenuk.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083325e837af---55056039388.pdf
    • http://driver-jazda.pl/upload/file/pemajetesukurun.pdf
    • http://cartonwrappingmachine.com/userfiles/file/norikobuvoti.pdf
    • http://joewhitefamilysite.com/clients/59967/File/27176351971.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1cf6be7dd2801c35d88d068f13d5d614/31279134901.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090fad31daee---vafera.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090db32add11---mufifuxopirilisig.pdf
    • http://myconnect-thailand.com/image/upload/File/fiwisidedebuliviso.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9aatd6ihat5g6337d3s2gceh5t/wezakuwaguz.pdf
    • http://er-trans.com/img/produkty/files/80993978722.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=barry+manilow+it+never+rains+in+southern+california+lyrics
    • 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_off0000bde5.bin
03e141f729cadd629b183bdac5a2cbee75255ef5d61290acab3f0403c9ee8e54
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE5 16660 bytes
font_01_sfnt_off0000e93f.bin
fb98c9e3c38fdd456fdbfe894e460495ba143122d90c48ef1af3e84b0b0655c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 11020 bytes
font_02_sfnt_off000102cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes