Malicious PDF — malware analysis report

Static analysis result for SHA-256 f064a2ca2a531cb8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 04:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a866e90c9f23db66c5ff39b17f40d41c SHA-1: 796130446380f6053f4953996074bd04884c16bb SHA-256: f064a2ca2a531cb86d3fb8a98e3fd9906da35acf11a059a98e6ffa9a81c18cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://sindhuinvestment.com/ckfinder/userfiles/files/dazapipipifavu.pdf In PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gelekakubozototuliw.pdfIn PDF document text
    • https://digireg.sk/upload/63498911492.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613736292b0a0---5630835068.pdfIn PDF document text
    • http://hasyo.net/files/file/jonumipelumejorexefif.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/72958403490.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/tapejubutojol.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408be9753da---15808493116.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/2950558199.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60684884711.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/pevuzipokojuzuve.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/67020181562.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wumajuxu.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/sojiratetapilalalezojuwu.pdfIn PDF document text
    • http://irollee.com/userfiles/file/titupat.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/41354545451.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/24281304572.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613846bc52f6e---beluvexetunozikodisaxuw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc37c184f---35264328410.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/pukenokijadobad.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134834919024---rajuxevunirimiton.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/80735374137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=disney+crossy+road+androidPDF 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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 10332 bytes
SHA-256: 52c63a234970e68cf4e7a6a046655d673fde54d1352598d39853f69fb442cc99
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 19712 bytes
SHA-256: b56052068a25fbff89179c545e1390d1d58bd4e772bf6edceeec8f2583e7860e
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1