Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ddcc964f2918bf…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 15:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dddf71fde6ac89afec2a8c5ccf8a1f5e SHA-1: b8cc56c5f2b94e65c6bb65ecd842fea37abe52c2 SHA-256: 81ddcc964f2918bf56c72961eb0f0c8442efcf6534f0541c0378984ff2579bbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farms suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=mx+player+pro+j2+interactive+apk+download PDF link annotation
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gezininokusumekidik.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/difakujenesavike.pdfIn PDF document text
    • http://chinazzjx.com/d/files/88263937944.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/gurawivojugutejosutar.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/44177897118.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///88624314595.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kubadiz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec1fea13d15788c7e874ca934c0b75e0/38714116178.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/20911907754.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/katolet.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/81265038964.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/50112420201.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/74157854384.pdfIn PDF document text
    • http://halanmilk.com/upload/files/papawakapavemedatuxire.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/92239684581.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161417febaaa86---wabavonek.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/92763122807.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/81087197412.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/xuzelodanepukeko.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136be9180367---vewizigut.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/dubawugefaroj.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3jiprje203qudc5t6l3e2mid15/bivikuxepakosig.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210916_202144.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/setasesawisobaluzegel.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb9bba1ce---54072621758.pdfIn PDF document text
    • 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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 18088 bytes
SHA-256: 25599849d6c9e21a32af4e46384b35597a14538fdfc50fb66b98b17768afe5d5
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 11040 bytes
SHA-256: 423f466dd748e838aef150f7418dbb0cc635e0705177d5451a2eb3c8652b1ac7

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