Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef37bb92fdfd5a1e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 04:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1716231033e5d307de8a94da4873ef92 SHA-1: 5be1859f67940ac0b0f9c5a8bd1153c903c9198b SHA-256: ef37bb92fdfd5a1e8f6c08aebfe6f242cc9468eebc7edee7a93eff2f569074f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://studioboscono.it/userfiles/files/68847705375.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c363a04068cf6ddbef21ef1eab712db2/89287710621.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613248592c91b---98947043090.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/q5gl658q2am5rb32ijeh7el94t/ligusavipod.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/pemuve.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/31486760789.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/79654557894.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/86815537097.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/luluwaboxomiroweze.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/kaxotubiwibegatoluri.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/pazixexasikafomum.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/90621620975.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210727_C7BB9BF14240C6D1.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/16081375779.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/17120383324.pdfIn PDF document text
    • http://cosyromania.com/media/file/5892055503.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/80723232588.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/173f998cb9294813719a78e4209b1b41/40400315265.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/79336299335.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/devewosuzirujililovugo.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/pawekububenunul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=grammar+worksheets+for+high+schoolPDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10896 bytes
SHA-256: 4c5feffc16a8da2961c8d9d25eb81fd3c4737a231895108e3fb2cfabdba20f58
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 17776 bytes
SHA-256: 9a46878ce374ca07a7f05d8c6599fa63a9ed46ca506e8823a55f423e36331a96
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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