Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dc369b18bc08ec…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 12:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d637a2419c070ff9c17ecf17819d4bf SHA-1: 599a49af0ad78abc39c260f0c621afc9d3498f86 SHA-256: a0dc369b18bc08ec726396e38a1e84ea78ae61a9e3314066d54c0358f93f6c57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the PDF's primary function is to lead users to malicious external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://curry-box-deluxe.de/userfiles/file/46951784859.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fa7a6f8b878db6ce36d2c7dadea75d85/45761196968.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/vafesedamiwikepaxorura.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1b96e641c5751cc0d742d6e6f358ef78/jaginonuxa.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/mamogagogoxasigereporunu.pdfIn PDF document text
    • http://fotossc.pl/_files/file/tafimebotimamojolinas.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3288c9dd19---momoziwuvumatojiwa.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076662fe67c7---64155641990.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/034902d42a59d9b53d7c2fc63cc76545/vutukipineresepetadabat.pdfIn PDF document text
    • http://simonide.org/userfiles/file/pixidivesiwekubivitib.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/483187946.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/fuwumevefulanetizi.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/58068912275.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/90d974bbe6909ae96b8782bd919bb898/99805379993.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02078e739---10885743089.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/57617750834.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/zilogitawotikezuwasavub.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/34160989729.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6ee96021a0db5ebe9163243789aa5815/tesebumasuvarezugugimob.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_150028.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/putawem.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd623099ae4---lenedovevaxilajex.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/dabimivo.pdfIn PDF document text
    • http://art-ball.net/files/file/kobemilosapajopujorupaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdfmake+angular+4+examplePDF 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_off0000bee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 17168 bytes
SHA-256: 35a6bd0aa41a450940eb7a8aa71e64b85d12514b210c19d71acfd150ab4f9e83
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10736 bytes
SHA-256: ac5e128d5c4c270ba0732c64fd6f721c5c53f888e7ee4ef2eaa21cccee193cc6

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