Malicious PDF — malware analysis report

Static analysis result for SHA-256 de759ca76bf4b499…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 16:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7695db7aae7a90507edd511d1c33df31 SHA-1: ce909697455ce1191dea8271c05b35a27a9e5284 SHA-256: de759ca76bf4b4990e799e6cdd1603ebcaffcd9151073fcf1c9da04b270f3f3f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms or utilize disposable hosting for SEO manipulation. While no scripts were extracted, the structure and URL patterns suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wodepcb.cn/uploadfiles/files/wemojowiwowijud.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393caa67fee---xojuwaderoselid.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/66769041136.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/jizosa.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/gusosa.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/95798596951.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/bagepatitexelizes.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/64116328341.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/50864604310.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/57601505804.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/menutebikerudizamamuv.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/boriporejigagujetozevimak.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nabkaoj1dq20h1e2nqv4tb1e97/bifadewubopelizikekaki.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/91236143843.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mi8e8lgvqj4olnetopnqnflgpb/45346787708.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/xavisi.pdfIn PDF document text
    • https://premiersuli.hu/files/files/8783707807.pdfIn PDF document text
    • http://venkateshservices.com/uploads/sokibopudat.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/67498850924.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/54802148932.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/pimidiwabuxitepiseji.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9106c0323189738eb39c2bcbd7396085/likarajunorezojizepeg.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_032347.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/33806948477.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/pitisoledixeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=filmywap+website+movie+downloadPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/50200956696.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_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 10836 bytes
SHA-256: f7f61d9062d2c97cb5740bcd9804b22e69ed6e9d545fae91c63d1a69286b01a6
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 17152 bytes
SHA-256: fa95acb3113f876094824b1bf0bcd681e49f302431bb603aa2b0e75c71a8c5b7

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