Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488ccff2b9e8e84…

MALICIOUS

PDF

88.6 KB Created: 2021-09-16 03:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da4aa13050427ae577d69d71aceb035f SHA-1: 82c4d887cdf231fd3f5a60192357fa508b8676bc SHA-256: d488ccff2b9e8e84eb5d7a60f8291caaa5424abcd1fae5c9409dd18c7dc6a474
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are identified as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bkdesign.ee/userfiles/file/ridek.pdf In PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/xovozasofopame.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/513490irqqsve4bnfbjhsu6doo/32203618932.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dubex.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/belozivorenegunewotit.pdfIn PDF document text
    • http://farmina.ru/uploads/files/48939737267.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/91755237050.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/42343782460.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jeziva.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/jironogubifila.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/ritozatinoletapozeliw.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/77928891975.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kudumenatuvatubanovorenoz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df13910776---8659212834.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/tipafomenutu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9892438dd6d4eda4fda7875799b7d46e/gamefubelexodele.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/naxevurutivitoderetemo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d574d96ca8---gebagexabevobarimazife.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5df943cba5804272a90411dd0ad4569c/gonub.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/71475919544.pdfIn PDF document text
    • http://gr-chem.com/upload/files/wuwadaxovab.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/zubuxagisukinavezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+sun+androidPDF 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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 18408 bytes
SHA-256: 396e387175b716320b26261c739f861314830e695668f9f78a72b545c55dbb12
font_01_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 10460 bytes
SHA-256: 1dbd158878d123b33aa43c75d5f3f5db159c32c8a0b13124f0dc9c591cd58d6d
font_02_sfnt_off00013ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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