Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4676190a6ee6f5e…

MALICIOUS

PDF

82.1 KB Created: 2021-08-18 18:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e1e2e08f243e8d415d8c9ed0dd4db3b SHA-1: dc1a9ad7a205d3e69c0448f1acd40f5fe43f9987 SHA-256: f4676190a6ee6f5ec6a0ca65b4b94ca7caa508d47850664fc7e125d1976783a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The presence of compromised CMS upload links further suggests an attempt to host malicious content on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=the+economist+audio+free+download PDF link annotation
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/piribedizat.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210807035637_406174.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0879f35d11---52183148634.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nupamuzupav.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/safiviv.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9e77f58762f4c6f02b16da28911e6668/58395071888.pdfIn PDF document text
    • http://sns.hu/_user/file/rubunu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609201892f897---bedofikase.pdfIn PDF document text
    • http://rayanchem.com/d/files/rarosivejafavejorumotagid.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e23e8dc97---xosiwukap.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9hl3je3chc24u6bf1012p813a9/sakutorudufoxitulirusoxi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xaxosasalokalofinusixi.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/nizatimi.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/wagoriretevik.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/wemanino.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/52574943275.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160900524d6b71---rapepufi.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/36350946035.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/11676ef1b51adf881913b4def3c04d8c/20782275744.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/woxanenivarabijemipen.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3fe6d3db---pibukofuw.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/xoxupirudijevatala.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/96599151788.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10888 bytes
SHA-256: 4d87367cb11c3f709e213376b9e5e247e7ef9fa992e4c4fbe5de36861b006045
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16768 bytes
SHA-256: c585a377eecc65d5eede40eb9b3d19002aec2daa081a1fe0a0638f39327e960d
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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