Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8f2a6286ede9df…

MALICIOUS

PDF

87.7 KB Created: 2021-07-22 17:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3722f4ad3d74c1844d692952a104ec07 SHA-1: fa25597bafd754d57ccc61cb0b97df434fd0e6b8 SHA-256: 6b8f2a6286ede9df5dcd485902ad2844933b6365d472e22de8f1692a331edb34
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous external URIs and a link farm heuristic indicates a strong likelihood of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e2e4c4bc0345d1ac0619e5d74a44e23/88376730645.pdf In PDF document text
    • http://kozszemle.hu/uploads/files/vugekotimato.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/cec462a3eb51270ff25327faf07fd218/1935614893.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/83876189385.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cab5a530a66dc956217ed8e03237f4f/difogufew.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609994eaa5977---dumovu.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/62191408271.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/33430503504.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6ohntdcp46h9b55qijsntc9n9o/gonomatobupapadukin.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/24b7ba72445ae9ea1752f7d8b9bc70d9/28462909418.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/tefofekudozikupebi.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/voromivovibijebozotevavaf.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/lowikad.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rhho4sjghiqmfsglqeqq34gsk2/nuvajuvorewufuranuvi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/545a83ca2bcefa7a5679db3e2a83da0f/26606098629.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa0ae3a1a---xulevejavewupimudivarot.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/souobtj0cmfj7cjie9vo6fjvce/82295086144.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/pubitoraniginugisewovu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/40118418250.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fnnejt8jquf5nvtavlobfkur41/lonewanotumevezugovepivud.pdfIn PDF document text
    • http://cocoal.com/uploads/file/goripuko.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e9cb37dab7476a03a515adc70602b0ed/wobasajomugoxoledigus.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/zexumamatisazezakap.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/56655434036.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/58234649384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=human+ecology+and+family+science+class+12+pdfPDF 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_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 17660 bytes
SHA-256: ea3f6176df234baf87e470b746ed2d1c68ee60ffd11b4269072a340d1d21b9d5
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 11144 bytes
SHA-256: 77141bbcc9bb7b9b6339c145c3ba0f3a2e0db87348a54bbbc6f913cb9a6be2c0

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