Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb9172e214e3ef6…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 23:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 884061957523468d7c987a2c99916a7d SHA-1: a2a929fe630dc34cb1854d3a8f3c997261bb2ddc SHA-256: ccb9172e214e3ef6df8b5ead3c1cc3a946d95954f93a5ed771540fcd42ea2281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8f216196818a86b6cc39b7ad96151468/64062173296.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7e2c804d---79958567082.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1398b5a8e5589426928491352db7bf73/14396554417.pdf
    • http://4bx.pl/public/file/83023299791.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a43a1d920---67207049362.pdf
    • http://heureka-cz.eu/files/15642699378.pdf
    • https://fruzsiflame.hu/userfiles/file/60904934776.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/aac26ca6bea187d2e276cd2098e650a8/35470630286.pdf
    • https://amd-export.com/site/upload/file/mewimuvilisamifoxu.pdf
    • https://tenfci.org/userfiles/file/tosipuloletaji.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97daaebfb---majabokalibaf.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/997218b80e38b45f85db26b22a501ef3/doporibos.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/gobik.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/fosunanumumedamalikitudul.pdf
    • http://holidayservicemarsala.it/userfiles/files/60096787372.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/21148745923.pdf
    • https://angelsstaff.com/uploads/file/19788526159.pdf
    • https://trexanh.net/upload/files/60665799523.pdf
    • http://alpha-th.com/userfiles/file/pamema.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ea74509cd92e29bde4678a67d3c0042b/13498945683.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ikhrna5upbr9jr704fj6pqjvo3/99233808172.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d714de9afc59c3f379ac723bbef2de68/86956195202.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2676f04---5750684519.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/77328659157.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+summon+a+tamed+skeleton+horse
    • 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_off0000ebbd.bin
b4260159a275a5d8312a540c7e0c52aefd7194972a6d41ac2c959eef837b0240
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 10688 bytes
font_01_sfnt_off00010412.bin
3829d502584b683e7437b597c3cb6f8578ff00ef60eec387b5fd7ec7f3fc6d44
pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 17100 bytes
font_02_sfnt_off000130e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 16792 bytes