Malicious PDF — malware analysis report

Static analysis result for SHA-256 726c0fdcbc8a7ef2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 07:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a560227c066c7f33be3ff954574ea84 SHA-1: 5e9bca530e327bc00d7e54214878fab70bbbfe34 SHA-256: 726c0fdcbc8a7ef283aa955ba046f0ffed3970d52e5aa0631b3f2e5159691c0c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://placc.info/up_image/72654773079.pdf In PDF document text
    • http://orderbestwings.com/uploads/files/83526427476.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/bolan.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/desagawav.pdfIn PDF document text
    • https://dacola.com/upload/files/65269192175.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35382567964.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/26828233667.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35434753159.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/76546717518.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_000330_6204.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/97124507814.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349717ac782---5781341581.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/menutebikerudizamamuv.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lezonupakafekolur.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/91247424720.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/nuxodijodup.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4b7df1ec4028ae452bcfe04ef7a51be4/bilexudarudibudolusukuk.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/deviwijilulazobuvewa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8697mpatgsijlhdlrt16577n54/jizowimajon.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/26601473530.pdfIn PDF document text
    • http://njxinbell.com/upload/files/87648460718.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/bopolinororewonosum.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/luduxirenimiduwikoxiziwix.pdfIn PDF document text
    • https://ms1oke.com/contents/files/wanegemileximu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=finir+conjugation+frenchPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_01_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 19720 bytes
SHA-256: f0b604ebb4c6a95ee26751a77666476a485d95a27e0e50a101666ed14ea6f525
font_02_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 10608 bytes
SHA-256: 28d7caa716a640a8c9c2f6b394260f3f28d5b3036fa649a889ae557f2de4c791
font_03_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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