Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3a7b308d8bb2b1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 446fd9e721d72ae69f7df494f6e22ee9 SHA-1: 940a58904de15f90a3571fb88567dfaaaf39e9cf SHA-256: ff3a7b308d8bb2b148b6017435e4e80e75b65dcce0d9fa6f766889a7466b5917
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+to+extract+wifi+password+from+android+phone PDF link annotation
    • https://adci.vn/data/upload/file/fevug.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/nosomifirorene.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614195c47e16e---mipigisukenopuv.pdfIn PDF document text
    • http://melvin.cz/data/33945668953.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/pebej.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139066fe86e6---16787654782.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/83243430d917da7787f1c5eba208d4e4/66034511430.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210906_091018.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/18bd6cc7b516ef0648bf779cece16cd0/berijutirediz.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/lisiwezonudilufifagomofeg.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a504414---3044780779.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/susolu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jopgt8ujso3o3s76bqrguu1d7/pozizegumax.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3285c6a7---98229006387.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/favufa.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/17278635432.pdfIn PDF document text
    • http://baoveantam.org/upload/files/30397536527.pdfIn PDF document text
    • http://sjhtractor.com/d/files/xawamuj.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/gabuxi.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/2332286090.pdfIn PDF document text
    • https://angkalaris.com/contents/files/kabub.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/90138691796.pdfIn PDF document text
    • http://elitacasa.it/images/file/58386734464.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 11016 bytes
SHA-256: 884c821847912f0dfcbfa6e056047b4dd355640fbdb66d1eec72e0d9041450e2
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 17656 bytes
SHA-256: 2ef524b5d578c829072c51a13afb3989aade78e479e77390025a0365b53eb72f
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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