Malicious PDF — malware analysis report

Static analysis result for SHA-256 748abcab363f0e73…

MALICIOUS

PDF

91.3 KB Created: 2021-07-31 19:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 857aea40b3c437fd5bac15fc760efa73 SHA-1: fa8c97f89d6e332f02bdf22f6b86fa89e2f2ac5d SHA-256: 748abcab363f0e733b29c5ef3f7350b2a44776407a8466a10bde147750dd18f6
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised CMS uploads and disposable hosting, combined with a 'download button' lure, suggests a phishing or malware distribution scheme. The document's structure and embedded URLs are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://laboratoriologos.it/userfiles/files/23832267998.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/42967725051.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/3134160858.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/83492391585.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/pizirigija.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adc972cf610---poweso.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/87434204178.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/zipaburudegelurawu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i0gs3rc4eqa5u0m8u74vs37nf6/19648237744.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68a06b976---26067972233.pdfIn PDF document text
    • http://hodori247.com/uploads/files/76970693784.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/16666421172.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c80088b96f---zovusefepasus.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ge63eu8jc136dq45rvnb3f7eh7/38704997370.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/hub9cr05epu27ta4kbjhrl02ba/werira.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a68cb77be---72329886117.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6c6cb698---bizewazorugijukawesapu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/318ae2a93f1cbe87a0634694f6bcf718/lolifepeluzuxunajav.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6psopaitv8e6q0v1g29o5n871p/45261208499.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/megefotozorabotobomas.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac03a0fa82af60cac72d09b4c4bec4eb/wefanuzilukegama.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/68425820591.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8rvqgbk71df0skitp0sg68uevf/96808351938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+love+thee+sonnet+43+meaningPDF 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_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 10988 bytes
SHA-256: 1690e37ec76b8b798523145c858719c1d144e6b9c8a4c64171830014ece46b8a
font_01_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 17548 bytes
SHA-256: 6bde34c6a070e2d59467b2d9793e5988fd0c88a93308005cfbd6b16cb92c03af

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