Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2d76827f397141…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 20:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b914fd21e9940cc7ee1ccd360ea2d903 SHA-1: 3a520898e3a58883221b993ec45eb107e79ab564 SHA-256: 1a2d76827f39714184b53e68b3433f2b308e485080e5bb3f649ca0559dc97a6c
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on potentially compromised CMS uploads. The document body is unreadable, but the presence of these links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/nuxiselajafop.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/10964948807.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e017c9d58---56636412134.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jekimag.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1e2660b7cf85e316b970e6a89e75c963/kubem.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/mixipezuke.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/18918847566.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2499cf82d97264d2b2762ae9099a0de1/kozonasuxubamebetodo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f85b95d2---68073165502.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca0d564e4---46168221359.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1c8470e22ab7e0c24313501c7bc13566/setadoxuvofirejiti.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2a5ea4b5b9e51eee6ca9e356ef60d9fe/majerewitub.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/350cpninm5n7nr2o9qonld8kj3/foxinuvugofo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/2136515490.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607019a2c07ab---37392636132.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fbab1c5b---fikomukow.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rkku5g7ta4pmkdtods084ufc5j/1154686134.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6f2cae1b---lepajekigopabigava.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/78354414475.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d40430e33c---fafadej.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7092d8e---sekateruwezuzado.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608af951db888---88620226242.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8bb24d85393f3c53d91741ca7dd06f6b/xezisosuxugakolap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=60s+and+70s+trivia+questions+and+answersPDF 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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10836 bytes
SHA-256: 7cd9393aebca2b1a506a964e08f418a62797620f2345645a53f123330258a09e
font_01_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 17876 bytes
SHA-256: 7c5be76cfdaec8fa538bad2be61ffa1b091569c490547b7f9bb7cb6047a9bfbd
font_02_sfnt_off00013afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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