Malicious PDF — malware analysis report

Static analysis result for SHA-256 35768cb9efa8f9a9…

MALICIOUS

PDF

75.5 KB Created: 2021-10-09 23:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5916ee43de67cdf2254b6be266225ec SHA-1: 05724dded1da3a61429ee4970d2ecc70fd0adedb SHA-256: 35768cb9efa8f9a945de99338612769121d6ce3b68ddfdd38ff51282528ad0d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or SEO manipulation tactic. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elosc.com/upFile/file///ITX202109131214055921.pdf In PDF document text
    • http://tsuiteru66.com/userfiles/file/votabigin.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/fomizudototoruxofug.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/zemufilelomanavasaxume.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/18688931717.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/62598251616.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/denetinifizebujemikope.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/24fabb82a4a56f7668542712e40185d9/supesepom.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/lisodosow.pdfIn PDF document text
    • https://fond.ru/userfiles/file/19769486166.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/32291196710.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1f161aa85---63155067154.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/savepanikamesuvawer.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/19532632982.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/57319756355.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/nemopazinabonofodifodapop.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/woxixubenaniwatiteliku.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/81362340663.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/bofenanuxigefonewabe.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/75469266782.pdfIn PDF document text
    • http://reylab.com/userfiles/file/mezizuzame.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cb81a440---rigonakuvixisepa.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109120345383800.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bisinup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gateway+a2+student%27s+book+answersPDF 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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 19088 bytes
SHA-256: ba5fe679c77cf10a914d35402a23fdfd08ca7cc0692a748fa95066ed8c1c6d63
font_02_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 10828 bytes
SHA-256: 11741da19d7fd5cc7dbd36fa7b116ea5e3a9d4fd8bc9075508328d1cca2ce115

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