Malicious PDF — malware analysis report

Static analysis result for SHA-256 39df88b776bed4b5…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 03:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 08805f1e0c4fd6bed955deb6f169ed7e SHA-1: f8dfaec6f936708d701fa47a40158bfb2b322987 SHA-256: 39df88b776bed4b55871b0e222b9f73deafdf6730b2031d20458e4525f32452d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other potentially malicious content. The presence of these links suggests an intent to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a3b5c9311f55b6931f7b411612247f70/98377196510.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a85b39c4c---damokovun.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/07aad77bec01529cf2630a74e510d87c/lasutupaferodadafifari.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/80491578951.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/58412482868.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ae0ec097---71993583865.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071975c0d9ef---2186923959.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086963a7cd87---65448511819.pdfIn PDF document text
    • http://princeverma.in/uploads/files/pifote.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/5886884974.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2e15f8d7---vudamojopuderafokapox.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/19618233868.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/h2brdhtdacod8lp652vlugmque/84095232299.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/kaviburajozawenak.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/86229459052.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/61890380816.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/xusetewegomer.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/renakeloxe.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ad589e375c53f7d98f7598b281e9c66b/bigafodud.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/llcja01rnrubemvlm1iavs98u1/polefuvixowejabosek.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea4844d62---dagurilemagutugajudawid.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e56f20607d0---37572467140.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/49874155783.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/pulatetaxe.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/26014833513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=asi+styla+k%C3%BCf%C3%BCrl%C3%BC+%C5%9Fark%C4%B1lar+mp3+dinlePDF 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_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 11376 bytes
SHA-256: 8ff227bd49305e925a08bbcaa1a3cd61976faf9fc1269d1014c48b953fa35103
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 23240 bytes
SHA-256: 49e711a14c01dad272bf437efeb41784cf59aaffe87a5cee55d10aa7abf29960
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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