Malicious PDF — malware analysis report

Static analysis result for SHA-256 4408b2c65d6cdb23…

MALICIOUS

PDF

79.3 KB Created: 2021-07-07 02:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcf75f47d8cc4c873117db75d56a7ef0 SHA-1: aae50b32a8fee8e9c72b952cfaea0828f5d3ac55 SHA-256: 4408b2c65d6cdb23c5d552817eff402e3e552cb7560e70e79c387ab9db504f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://southport1969.com/clients/861680/File/foxekerokutexuk.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/zeligebarowidudoborikumek.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f184f0179---kokerasanomojunukemov.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2ffade0c---34129592854.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160816a7809719---92011328772.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d23c32a4---fukefefedivizarefevibana.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501042643956986.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/17461823793.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a6d08029---puxozapabe.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a9522417e356eb17a6f0078e4caa6646/majifotiwemomorona.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed7a3f37f---43750002384.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a9754870210f0433e6299244ddd7171/10267196067.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc69c86506---47886659442.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/pekawativuletolowirofopu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5148c16ba---71762422455.pdf
    • http://alibabashipping.com/userfiles/file/43852658303.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/99033223028.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f6f80cef0e71946cc4b9dc1f89c30c39/77697471684.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c305975ae---55599086212.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a02034d9f5d---sozoxat.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8765358abc---89414373603.pdf
    • https://dbmotorbrokers.com/userfiles/file/75032490552.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/kowotapasidenatikobem.pdf
    • http://casaatlantida.com/userfiles/file///23890678031.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=concentration+is+measured+in
    • 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_off0000d3d9.bin
eaa82be78732d6b78ceca9255d4a2486bb8127ec52d2dcd2cb60f2f6b25036af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 10616 bytes
font_01_sfnt_off0000ec22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 16792 bytes
font_02_sfnt_off00010434.bin
58aabc766c073bd7a97a4afc38e4ce363b85930ee8aa078cbbf98bbeb6059d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 16804 bytes