Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c6d7f211dc2b35…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 11:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0755c712c13b8ee838956ebe92408604 SHA-1: d4fc5a73823be0dcf8cca433dd32c8f0471a49eb SHA-256: 57c6d7f211dc2b35cd27d78b8122faf351acd6185e628761d495fbec728f4d71
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to potentially compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/67tajl7j43j38ver8hk4l8059l/zokuxeberodazosexejulewu.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/jitejikivit.pdfIn PDF document text
    • http://candientushinko.com/images/file/mijaxamepoxevipoba.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/gubufosopesagorogutawov.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/45620514896.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k8dhvnre00rbjoch3m8iipb596/65375975659.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/65637885318.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160beab3a8f603---wozuxujevokamavegegeja.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/86cb33f65d5d65e8ff24d79e0b2160b1/dedebegagikuwotefodupane.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/3048135200.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/xetubipek.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xurusotef.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e028096aaf---sariw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b368c4661---13195863035.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107201155454827.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/24501070074.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7eed08703a94baeb2ca67eaa6dc1b7ba/bijazokasuvogijofum.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/11549830838.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/42032117560da53a2b0b92.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/ditow.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429133627962586.pdfIn PDF document text
    • http://charontrade.hu/data/file/doxul.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/67958908351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=10th+tamil+question+and+answerPDF 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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 17220 bytes
SHA-256: 08df262a8c92720211de1fa28ab119dc183ee08d55e2fb1fb43a81f46e790282
font_02_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 10920 bytes
SHA-256: 6676327d46e7d2b0844dc2a05aa84b46f0f0fef00330b8f1efebc8c38acbdf47

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