Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04661fec528c5d3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 12:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d02b38c0a4b413dfa3bc2bbe13686ba8 SHA-1: 707bb3180ea03dc1855910c059df34be85697f2e SHA-256: d04661fec528c5d3d9225e6a1f0e26b3db22eec4b4da0faff6e5af463726f8f2
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 delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs, some of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=writing+dialogue+practice+pdf PDF link annotation
    • https://indiachristian.org/uploads/files/bamazuvobo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613132b571f83---16913820501.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/zepabidatexukezesef.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/92320530568.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/webusadimofeviponebixel.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/33422696046.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/mabafupig.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tamojamulebowudetuparefet.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/losugewasezaki.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/banaxokogexuvaze.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/92871325178.pdfIn PDF document text
    • http://checopharma.com/upload/files/59228447972.pdfIn PDF document text
    • http://olympusflights.com/files/files/33965790515.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330d6a67ccd---satep.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/14668534868.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090723365573499.pdfIn PDF document text
    • http://packamate.com/userfiles/97713779674.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/26679475150.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109060058308245001bdi1y.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/82290609448.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/5140325604.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/pudak.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/12121376863.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1836fd3ca94396cade721f18cd355cb8/nefuxatamimuserefowimu.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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 10720 bytes
SHA-256: d52400a696c8255f2c8b72473c0ffab35d3b57653171b851d5bc57814a0db014
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 17288 bytes
SHA-256: f2c0f4e8a2e0038aac50cd9e6ab3ed26a376759e561199279be416cdf33ec88f

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