Malicious PDF — malware analysis report

Static analysis result for SHA-256 608eb9de69bca5d5…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 07:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8905e57beb498cfd1bf21c0a60586c9 SHA-1: 0dad231e1d80e54bfe940d2ac3bf9221f8ef2dcd SHA-256: 608eb9de69bca5d5e49da177b13f89cb335040457363eefa392d3fcb2092b62f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to host malicious content on potentially compromised infrastructure. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://synerhu.ru/uplcv?utm_term=casio+edifice+eqs+500+user+manual PDF link annotation
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d45da1080---926762994.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/52876761385.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/welinodobeva.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/69302f93282687c8c451972ff6a58f21/67181725004.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/dajitovewopedifa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b583abfa40---36160451564.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/54732707633.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fca2b51c---xefajuxuxemeto.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/98276714207.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595cc56a14---93404625559.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202182857368838.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d201386f55---34741415087.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210812175348.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98830735497.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/78569308593.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d7fcb2b1d7694c028b74e026d474d525/37947255058.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/06f5525c3d82e7c31773c98fe85287cf/rurajisasunedozitewanevol.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/kaxumawojumojabijaw.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/kj314o902k0fdlg2sf9k9ccppf/24295973854.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/lunisawupatotetafabuxid.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/128781544360c28c2fad59b.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tegugonutaxerurapabowi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/42e9cec7eae8fc0c78520c7cd13f711c/muxolezopisi.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 11072 bytes
SHA-256: fd807f14e41ab29982af4d5d59eadc6f845d9ee06efbbd63c8bc8a9697856901
font_01_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 16612 bytes
SHA-256: 6d72cba9e5ffa33fbf2abde72c8a147c7c2a995783c78000976530dc654fc978
font_02_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 25768 bytes
SHA-256: cebd88954ed6c1fcdf67f863c009c29efb9094961b88892c527f787ef2915193

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