Malicious PDF — malware analysis report

Static analysis result for SHA-256 63999af6826faaf2…

MALICIOUS

PDF

90.2 KB Created: 2021-08-10 02:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f99d5440f72be152ee6e25e60eb7f0c9 SHA-1: b896f343d07ad1c94cefb8e57da98c0d677049c3 SHA-256: 63999af6826faaf296589093e69685bdceee78ea18519bd5d9a9563314944228
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://duquenne-moteurs.fr/webroot/upload/files/25948846599.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f79438694---bowigipopuvob.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/03181fbec4a3a2418f88663efe56e74b/82884141589.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/gaxanolo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/014d2d156d61ee56935e829abc0f3f43/pukoluloz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c285722bc0---37333739356.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f423ed063e6---93743505244.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/420d96e8473c73e5076215b1b3f85600/kuxilawixeluxis.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/48559749701.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/suwuxikorizarineba.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47120f01a1---lesamewekizebetixetuwejeb.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/44885062343.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/wenavunekomo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c810f8d3d935c52f017e72f1783bf1a6/vijebe.pdfIn PDF document text
    • http://yuhongzg.com/d/files/dorevinaxunujiponupikori.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/viwum.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/suwagavasawalovarometeb.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1fbd4cc43ff0730a02b78a96ba7a7265/59270526727.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/36875114642.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842c6e47c8a---13720568453.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1faac83637---16457884923.pdfIn PDF document text
    • https://irantruck.ir/data/file/70093430472.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0643436b1341f48396568e49386eca53/xapajo.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/60223242666.pdfIn PDF document text
    • http://torgoborud.org/images/file/88908120766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+bollywood+movies+for+free+online+fastPDF 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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10920 bytes
SHA-256: 78f901520bdf21856a8a68fefa371671247d39d19a31e923687bb7cb96706c19
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 17260 bytes
SHA-256: 14cf22147d1f49f6aeb432bec8261dcecfc4e4407024893009940107c385062b