Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b9c9763bccf84a…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 09:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5297db756e8ea97eb95d4b88ca00c38d SHA-1: aa7650a4cc7a6f87f1e69c4afdb710914ed35644 SHA-256: 73b9c9763bccf84ad67683fb3a71cada7e50f804c582cfb11819286be329a7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=supper+at+home PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f6f26006---fiberekameguvebemajan.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/39989250204.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/luxotemije.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/wiraradevapetolejapabo.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fafeforitomaxokaf.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3osaobargua61j445m5bevklpf/xixuditefu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68605896855.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8d9b0258a06e493ee36dd9600ad5859e/wozob.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb47a309495---sijijigupedovuxef.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xezumotopuzoberujezofuz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c300c984464---93811027244.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/96139238748.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0688061676---kejerojujigaraput.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b16si22mek7pn0vj6g7m1818e5/wofoligevokip.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/luziguwafivi.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/pexugukafusagibujizibep.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d5b35ba87c28236edd7125cc6c2d7137/93182218757.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609885d589cf4---74850436561.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06472db69---51641575062.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b319734a5---daminexetumitez.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/85ccb89eda3c93342d49f4d57e618aaf/39919866412.pdfIn PDF document text
    • http://nktrading.qa/file/files/27138800346.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/38763373612.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 17420 bytes
SHA-256: 2b3f69304cf66f5eaaeeaeea38ea11adf5f89c35156bd3a92f6e3dbccb6d46d8
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 10284 bytes
SHA-256: f1f71e2e642d4d8555b9ea214687ca7e7b9c0c556aa25657ba1c444c53cd6a18
font_03_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 17716 bytes
SHA-256: 72e9df92e1cebd0a7dc0d9ce38c161e00c9888d86f237645d3a4e4572f9414c1

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