Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb68dd97b3658f25…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 10:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25fc710b6f63ea0636fed48ed705ac0b SHA-1: db53e31db42d52f33ef5086055e02f036dafd61c SHA-256: fb68dd97b3658f25e6347c0451043ad82fda63b0519b835f38a3d1044a20a72d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a payment redirection lure. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to lead users to fraudulent financial instructions. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly indicate a phishing or financial fraud scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pixomot.ru/uplcv?utm_term=how+to+retrieve+old+whatsapp+messages+on+android
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf6cb1c6c---rogodubolebadimaruresas.pdf
    • https://dolaodong.com/userfiles/file/71431016696.pdf
    • http://kursadowicz.pl/Upload/file/rivuwuluzifovemuzos.pdf
    • https://korovin.org/site/img_ufiles/68440757477.pdf
    • http://arniuniversity.in/ci/userfiles/files/dirarujiviredukilujofoku.pdf
    • http://hangtatmj.com/userfiles/vuwab.pdf
    • http://erago.cidees.com/uploads/files/lazepadozudagaxosef.pdf
    • http://shepardinteriordesign.com/rw/upload/file/47800542462.pdf
    • http://volkshilfe-vlbg.at/images/content/files/fomesajuvajufazugaxuda.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613054709baa5---wipun.pdf
    • http://pokwuttibut.com/file_media/file_image/file/17057202310.pdf
    • https://n-v-v.dk/userfiles/file/sidozir.pdf
    • http://alhambra.kopanramen.com/uploads/files/tobefakegixotag.pdf
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/24179754211.pdf
    • http://zsdbiopharm.com/upload/files/balubulalukitenufebalij.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da123b8d8---67009062929.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/repanakudoxepevi.pdf
    • http://a2kat.ru/userfiles/file/wopivavaxoto.pdf
    • https://lyna-garage.com/htdocs/cljr/data/files/29414086213.pdf
    • http://goldway.jp/upload/board/file/saxoxinegole.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/gupomowobuj.pdf
    • http://telektrans.hu/editor_up/zejobewurapumiwivibadoxim.pdf
    • http://obkladacstvikolar.com/content/vovapikekide.pdf
    • http://schokoladenfontaene.de/idata/besirukewijok.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_off0000ea04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 16792 bytes
font_01_sfnt_off0001021b.bin
64d07d545c47ed5c170573bee75305c09081c8219138e13e98d785ea9a1d03fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10980 bytes
font_02_sfnt_off00011b32.bin
7b80341504edfe6855ed6fe329c2a27e22f5610bbbbabf37b95b0708a13dfeb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 18780 bytes