Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f938c6e6786552…

MALICIOUS

PDF

69.1 KB Created: 2021-09-04 06:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7c4bf5277706edc1d4012afad4e3d13 SHA-1: b51e97b884b544214f3823daac0b57e4d2ac084c SHA-256: f7f938c6e67865524341a089e2d15505781a9304c4ae80f3ff52c5a563adc1e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, but the overall structure and heuristic firings strongly suggest a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://kildevangen.dk/files/5438121854.pdf In PDF document text
    • https://ubitanduk.com/contents/files/41859779277.pdfIn PDF document text
    • http://araonline.hu/uploads/file/rilurolurukefex.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090906bbeb2f---kerov.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d62eaa088---dotixuziwegefi.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/bubiz.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/dupikuta.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/pudejozeximubozenuwo.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/sofuragazamag.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/49818998596.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/13597487703.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/24828066082.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/88201540721.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/fesovujusezovutidobip.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132af9b04d84---nizabe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2d5e718f---tigodiz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/79bba7d5c903251ed11f89c2c6bd8601/32526730801.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d494b34709---zefedagod.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/17131307319.pdfIn PDF document text
    • http://hasyo.net/files/file/75501474990.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/4901684422.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qk850utoj59utp5eibvsanjf6/14234793677.pdfIn PDF document text
    • http://twtime.com/uploads/files/202108310326071542.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087a02bbe152---75890427605.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4qmv5sn4121vm8smckro0rerh4/fuduzadanuzasuziro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bf+skinner+operant+conditioning+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_off0000b332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 10892 bytes
SHA-256: 3becd5fcb0e3093ec748a9ea85901af3b0ae4e943aeaaef7ac535f974a918198
font_01_sfnt_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 13976 bytes
SHA-256: 421ffff95036583520131076de39aa952ff6db3d8bb8e624e57f3d00d7fb0801
font_02_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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