Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e221693bffdbd01…

MALICIOUS

PDF

74.0 KB Created: 2021-07-07 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d884592bdcd831cfe7807a7191717d4b SHA-1: 1191762fdcfedd97cfe5d60c9fed5ad3e0c8fb04 SHA-256: 1e221693bffdbd01e32f78ea5e8a8ab9ad5e1c7fed265523cf4c75ae830a04d3
164 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 a link farm with numerous URLs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5921503---63698580580.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1ugv5gb9hn6pgvicckcu8s2c2i/pukadiwesagozazirutu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085f164aa4c0---busekijemafafi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gofodixojupexitel.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2aaf97ac65dca5669ddf5358f3b5427e/81919825675.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c204e9eb---23622246550.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bafcb33457c90dbc96a357bbb0614947/ruzunotalibarop.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609102c719d13---baxufamezuxawota.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35c307d51---kimitaloji.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/43609300835.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/gigate.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nusifuzuw.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/15694292314.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zakumuwomidilumatovevom.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/85503328605.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/bajege.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sozib.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0adc763d954c649033bc3f3623595fc7/98216620885.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511011939452130.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/538f5794ba8444fc15e503c287480368/65887629500.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/pofogozeligaje.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2mblncosa7o9i4quhqo2lrnkl1/lupejotedatumakoka.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/45799169695.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/larunapuzegerubed.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717b410d276---xozarixoviwexidubeweke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wordscapes+cheat+level+5196PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 10996 bytes
SHA-256: 918f557d64ee1b0c9d6f8407a2f408ce51095af2c90ff2f6a289efce8364e1e2
font_01_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 16144 bytes
SHA-256: 1fdd6ad2d83651ebcd9baa89932aefc9567936d075d6de8bbb426c239294d716