Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe378db71734b4f9…

MALICIOUS

PDF

90.0 KB Created: 2021-08-25 06:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 33755f2a4674585e82ff55346135a31c SHA-1: ceafa2eee9ea445438d7b1c3fd441b4d1d964c0b SHA-256: fe378db71734b4f9a4a56fba8f7897547013d8a2155c8c173e722ee70902b8bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8d18f48d7061da2093bb2595ed65a2e2/58794412477.pdf In PDF document text
    • https://sharjahcements.com/images/bulk_images/files/79762505341.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c8c61a40---85197050565.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/87ac140039c2e02c0617088e3d19108d/pasebul.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/1832868910.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/587c1626514acb39bdfba4cc6ea2d431/91026026892.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/80770265720.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8178b090a5---18395531384.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/kixosuxef.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/805ccf9c8cc5f879161a1c60d89ca93d/70060818030.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tafibirud.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6171e67502---67446390828.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/37784738336.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/bavuniku.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/4171127933.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/57069851988.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/7070835830.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ba8f57eafe3e9764073c3000f57c3a16/rofuzavatatosike.pdfIn PDF document text
    • http://ruresept.ru/files/file/tiruk.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e0a3pr0lbpsof9rtm45u85rvic/64724626313.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d57eacdd---ligafo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0a219f486---lezojazedubetis.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/77538541527.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/69595546223.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/78297638058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+lose+lower+body+fat+femalePDF 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_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10652 bytes
SHA-256: 0dc504708b96f2c60d99ccf53966605d17adc7f8d3a88f09e0506a0fcdcab4cd
font_01_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 18808 bytes
SHA-256: 6a25c9e057171f5b610b447a5fa6eaff40f5ba1e2726ab9a6f2841427498b7d0