Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd32385edc52ca0e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 21:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c56dfc3f1414bbb60b219f546aba0ea2 SHA-1: e16ac9644727f4dfeda0205c6e7a229b2f004318 SHA-256: fd32385edc52ca0e1ad61dd90801242db44f943007d404b101e69ca9348a661c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://blueyee.com/upload/file/011103442473.pdf In PDF document text
    • http://smenergy.kr/uploaded/file/168039091461334ac25d95e.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/19510079975.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/tasusuxijo.pdfIn PDF document text
    • http://zeci.nl/im/image/7444559762.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee7ed2300---nerepejafidatebu.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/wavoxamekikomutax.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5e53cd0b---70744994447.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/66858100137.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd940137f5---42659891647.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1c9920776251c270d099b3ea69649fc8/48400747759.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/74402314194.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/gilotuvikenaluzukotuva.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/27537825608.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a96f43474bf1122b0fd8d89dcb9894bd/lulekunogiwugifodogab.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/pevarokapi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/34698109394.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/91324843796.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/56090698438.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/6231418174.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/60075233239.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/20742733212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=my+talking+tom+modPDF 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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 19888 bytes
SHA-256: 5f51e248de535c45bae0d2e6afc45a85a8e08ded73466058ee1eded105740785
font_01_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 10392 bytes
SHA-256: 0e3914c092f72331601186bfdd569c40e0765bcaac681679c3d3b86a9490081e

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