Malicious PDF — malware analysis report

Static analysis result for SHA-256 2725ddd5fcfb4f0f…

MALICIOUS

PDF

98.9 KB Created: 2021-07-16 14:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f1c31c778c6c4e2695c84731cb7f8b6 SHA-1: eaec42c73bd6f4d851548d812ddf8a6f6fe0b116 SHA-256: 2725ddd5fcfb4f0fb4c3b095429242301de5beefb10a36749f84f3d58827874d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating the redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/nizeveze.pdf In PDF document text
    • http://vipforiraq.com/userfiles/files/bigase.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/76699f9a608491d17952087b160e3d9b/68290080165.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/zakoduraji.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4aarucg135n71cbj0rsccu0qvr/58496044762.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/vagironerizujowenabebu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc385cb25---57589412016.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d452071ac1fad3b0c7cf29f923cc4cbf/jizinozusipekila.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/risisubekifobi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a935f555---85482095241.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11ec328aa---56798838279.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72098d36b---39917992069.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nomevelemapeto.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/80603948426.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/sidenotapusesida.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/fegap.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/35004059028.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d6b09f8f---74710537789.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/93c6ee00e02d8c1e856b9006e1a4913b/57984854731.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf2b623e9---51026969246.pdfIn PDF document text
    • http://darec.sk/files/files/kukupif.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/11908497852.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b205adc7ae9d5c39047a004018a7ab8a/58713818505.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/tibudageniwupozikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=acadia+national+park+opening+2020PDF 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_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 10836 bytes
SHA-256: e8a8b8ffa544fae0de0785ce202cb5f1d571012748c85aa618855815002c97c8
font_01_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 17236 bytes
SHA-256: 848fba20a7abbc6f25db11c5671bd94870d537c5a3e323269e6674920e21fede
font_02_sfnt_off00016627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1