Malicious PDF — malware analysis report

Static analysis result for SHA-256 0646fc973a5451d9…

MALICIOUS

PDF

89.1 KB Created: 2021-08-19 18:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6de22396b714c9904b9e4c03a5833e41 SHA-1: 39e4a491d9ebe9befcb5ef2b9fb9966680eac8e6 SHA-256: 0646fc973a5451d988d0eb63c854f2c8c3c5cbbf35f06f85e620c676ef947703
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links and the detection as a trojan strongly suggest a malicious intent to exploit users via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rajakeempat.com/contents//files/59119551585.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ip9ofhd37ouolr5vk8c0u5sf0q/kodoferu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/92185446141.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077670ee031e---joropikofinevosom.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e163b9ebf5f3f38b8ef59e3b9fb9206e/58210821847.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/56977582950.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01dcf23f25---42772786945.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6pct66689q00294tanjir3gcq3/10989217718.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/lawor.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jinov.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d8b7e087---ziguxiguxagawevun.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/torapip.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/80790600098.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e941e20e7a---35588769477.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/2863034510.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/puvubu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rewiwovipono.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfd13885b1cc379407d7622e77340687/sogimefevanoj.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d61321d589---17823368382.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/afeac9994b2bcd750838ab1271335b3a/55016090496.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2a545e0f---buwedew.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/konizivewovafo.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/wuzekefiduzogapuped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=class+10+science+syllabus+2020+21PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774356af224---fidadegasurimepeguwa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 17000 bytes
SHA-256: 000f31ccc3ea267dd17a079c852ab764cd057dfa984499dfa3ae30ac3fca374e
font_02_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 10584 bytes
SHA-256: 90ad6a183e61cde159baf13923fb60f6070e2f852536151814aa88374c90ca0c

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