Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff0fd6bbd6bab80…

MALICIOUS

PDF

93.1 KB Created: 2021-07-25 15:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 091054c9304d8292496d3739c4288b98 SHA-1: 5e25438a36c1ff31075a41616e1de8d880002399 SHA-256: 4ff0fd6bbd6bab80cfe7ef1631a2893ed291461f98b4a6936a931e53cc6e2514
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to facilitate access to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39161630211.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h519iqp26qtd5076q6sc0ddd74/nojalegunakut.pdf
    • http://phuvuongcorp.com/luutru/files/47554150848.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kaui781dp4vef7ide3r79jrldd/wupoj.pdf
    • https://fuoriscena.eu/file/99081780697.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbe517d63---masononimuzan.pdf
    • http://rspon.pl/images/wyswig_images/file/81495953946.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160886b5335352---kuwigiwiteleruw.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa82e0c2f---fesojutilumev.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/02b1f62a7156959d4b5d6681927b89de/29427470295.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/24993965684.pdf
    • http://wecans.net/_UploadFile/Images/file/23905615606.pdf
    • https://betalinktech.com/blmedia/file/77762387452.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b8b699263fbea7dae4433ae49ab52b/firesotetuvisezesaj.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6fa0ecb9e---71593900034.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/trjphubdr07p0ae4a42im2jjm1/nadomemodubeb.pdf
    • http://4bx.pl/public/file/tugozodi.pdf
    • http://exhibitionchannel.com/upload/26441978257.pdf
    • http://astro2sphere.com/admin/images/file/sixorasepevenufepabud.pdf
    • https://thinkhigh-tech.com/d/files/6157592776.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bfca8e331f95231b3f37c30696064a8c/15737668021.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5626a87fdb---26899447047.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/9876128667.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/77916171846.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=como+recargar+diamantes+gratis+para+free+fire+por+id+gratis+2020
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb5.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16092 bytes
font_01_sfnt_off000101fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16792 bytes
font_02_sfnt_off00011a11.bin
fe998f33e928be237a80b86ff3965938de002d32f55989bc8bc0ed2a246e0562
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 11188 bytes
font_03_sfnt_off00013414.bin
fe639a05e7cb60bc8ec206bd0b770b89ed809629df3f782c11f18609e845a8c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 18044 bytes