Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19ba39cc4a26f2f…

MALICIOUS

PDF

97.6 KB Created: 2021-07-25 11:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e5641210b079089f062c7c005c28a06 SHA-1: 16f8c1c05098627491f2b3ed18e93e7cbe78c295 SHA-256: a19ba39cc4a26f2fc5ee33706bb56ceb7ad6bd920459c187948b7547497529cf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest an effort to manipulate search engine results or track user clicks for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f3f7699fd1716343b792e1c57e26acef/73442632424.pdf In PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/fovozabekerigewenafakuw.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/50665984306.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/84665811759.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ef863f2d58211755a6a8e703fc180664/53026214077.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/331882514.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lejukisutikevusanagolu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/95d327863031b0c8cb1a8f9ff3215f95/28636184013.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/009a3e99be22b42ea914696da4184d40/wufitewirawobudug.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/674792747cd1be18f24e459abfcf93ec/jevat.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/69214752778.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5164cb6205---kivipobalaguvumavasokeba.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/87603980041.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/17283688388.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074344157e05---20736681751.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rabelap.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/66df39f16dcf14c29bc7fd51e6508aff/kumegeb.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/siralebipotexi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/tegagakonoratiperodatira.pdfIn PDF document text
    • http://christopherdallo.com/file/79028745877.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/pasoxezamalujewonudiva.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/p3upc06vt612ddh0l06hb0j2n2/wabugegorimawubexasor.pdfIn PDF document text
    • http://dalaichau.com/files/13448547417.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/drp8k0ckeobm7820d11huhrs94/17467284034.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843ff43acae---dudejapunaziwisofetoxez.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107210130314104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=in+which+european+nation+did+the+industrial+revolution+beganPDF 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_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 11136 bytes
SHA-256: 3cc8b10cb3db80ab3f47991baa95b93858068da1cd980264a87033d5ae51a623
font_01_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 17660 bytes
SHA-256: ea186509c62e79d39256071aa498c22a650df417959199e0a16856b8e3850095
font_02_sfnt_off00015e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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