Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec33c5f87f758237…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 12:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98be26ae8d3f4f9f2a6486b06a99754e SHA-1: ae2be56558841d42fe36e7191b9a22d56d09a937 SHA-256: ec33c5f87f75823705a6653cce8a2521abc0f3a0adb58cb24e8c58124c827a65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or engage in phishing. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://drafthe.ru/uplcv?utm_term=smash+bros+2+online PDF link annotation
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/zazopekuruxoxetori.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/73577740570.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5e9ff1a8b7eae2a761d972499d701378/30759438301.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v2i4f7lhus94lmuc3gj6dftb16/daret.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/31110275503.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/12505596557.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/mipisevebo.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/lamekej.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/48903e6e5799136f034c9e94202849b1/xofuxadikomalekiva.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/93084242583.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gejir.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jagesopofonalonazutivip.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9622d061---sologesajavitejegasofava.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ebfba6c2c920840eb5ab4d2465b7cce/jijikudatezabuwezilipi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parutisudotufiz.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/ziranufimeminafuzuji.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a864a9150e---xonivawotik.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0f8c18940a0294f920feb79bc4be48dd/pexukotaka.pdfIn PDF document text
    • http://www.moyekolodin.com/files/17052900557.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/69568737170.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/091327fa7528e731896995b29bc1478f/24645206701.pdfIn PDF document text
    • 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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 10608 bytes
SHA-256: 2f92e4e9f864ca62512813d390209fdc5914626fbab85a3db9b3f37947bc682c
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 16864 bytes
SHA-256: 1680cfe31811d60187003d131d006e031e5ae34e71fe21ebf4e996351262e4a8

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