Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0693ff43b3884e0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 11:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fe0fdac5e4925b09c506b7925485037 SHA-1: e192ca7bb22a1968e6b2a68257039d109e8c9b5e SHA-256: c0693ff43b3884e087a56ba6fb6e01268a3f4ffeafb0397484e7d8ed64faa8b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised or disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://teusz.pl/UserFiles/file/39009645227.pdf In PDF document text
    • http://onfireinteriors.com/userfiles/vimizuvulixedulis.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760d1d26b0---48039214190.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/suzumod.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373a963e43b---69431205181.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/josaxas.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/dipaneguzetuvenofadu.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/xomuvizojikisesijudo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad07909b6---tedijujurure.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0b742a42---bebisilibitoreginalikubo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912112246592242.pdfIn PDF document text
    • http://briztravel.com/upload/files/70478911728.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/4252881599.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/pamoxularijax.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/21934750708.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61320e607cdc6.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/vobudajobumaxog.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/70460678333.pdfIn PDF document text
    • http://mamitobe.ru/files/file/pasuxeve.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/75168175271.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/zomizitawutaxesanozive.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa74d72848---mumovujajade.pdfIn PDF document text
    • https://cargobull.cz/res/file/limuwin.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/af18dc58d8c95fed8c5ac6ad4b7540bd/boxane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=geeta+in+gujarati+pdfPDF 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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 10608 bytes
SHA-256: f7d6c945afd0d551f2be7217e5da7c50e6a41cb7ed7e0a36f495ad0c7c150510
font_01_sfnt_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 16728 bytes
SHA-256: 0809758140e8e8466bdfb1a4eaa534192671af32a5bd06dd7a12ab2d0244b0a5
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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