Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e20ed3b60ee316…

MALICIOUS

PDF

81.7 KB Created: 2021-08-12 05:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5cc8490fd74a70ddafd836dcbf4ae93 SHA-1: 5d3061ba2aa08cf34764a2379222d3be4564e310 SHA-256: 56e20ed3b60ee316692aaf1ffb640f6a9c8a99d7a8964b0c5330a58def63149b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dfh-consulting.com/userfiles/file/52595916749.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862e8695fe3---nigodomomobik.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/61917760750.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/78362374483.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/38575007298.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/tfatdrr7eosgo95fpfs4726plh/sinigutazuselagud.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210629060150.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/8271515357.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s95iegdhvnob7i2cie3rrtna80/kazezugunume.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/62141053403.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/66170196638.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/2854016912.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb35c30eb8---85279509861.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8bne2ji17gak9kcurbks6k48t4/95089547707.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/nutokajidivuximiditilewab.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/10646831077.pdfIn PDF document text
    • http://caramelitos.sk/files/39808305447.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf56e2a6d---3825136696.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/feecffc665caff8e1e3684ba31b91108/46291228341.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/1664f324221eaca692f52aa15f684f95/punabi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/43bf63dbdd9e4804ecb9c464be45eeff/puxenuni.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/132d126fb836e53846f48a31907c5668/matogulotuvubuveliwawimo.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/60965205524.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610613eb9fb6b---tofufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pci+basit+ileti%C5%9Fim+denetleyicisi+driver+indir+win7PDF 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_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 18000 bytes
SHA-256: b8ed74b332e7818b6cd7af2a990e25cefd34380271b5a8d319f30a1fd3d400a2
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11112 bytes
SHA-256: 733005ea5046809be086cd955107108068ece3561e207820c4c5ee4e97929a0b
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1