Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81200d8814ecf97…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 12:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41df83710f914aa42ae32ab2a1beefd9 SHA-1: 1ccc5866ee6b9062ddf3c202115d6b108999bd28 SHA-256: c81200d8814ecf97f2da68ae60a6c4c7efc6518aa2eb3d50d501caac6da3db81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous URLs. Heuristics indicate it functions as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=how+to+transfer+files+from+laptop+to+iphone+via+bluetooth PDF link annotation
    • https://museuminiaturesbesalu.com/files/tusazibikeke.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/mevosotinabapivi.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/46774928304.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/22591498762.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/32602918951.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/54153347029.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbce5614b2---83097908833.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/voletuviwuxe.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/sivegesuxesarowus.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a57e1be8b---5206098523.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wiwunuzera.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/xawivibawad.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/sivezulodijevaz.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/41027659440.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/vifesitugisitenodugom.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/15738341230.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/9801681041.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/97955772611.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/96727123848.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/gakoxurotobakemibat.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439f7d25a40---tirofusikepozut.pdfIn PDF document text
    • http://boldogelet.hu/media/45010369826.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/90991635220.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/12768487318.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_off0000b01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01A 11008 bytes
SHA-256: 0dacfa9d1c9595fc358c572ceec1d18e7fa29a8b044ff5fcdcbbc90f9f7969d9
font_01_sfnt_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 16720 bytes
SHA-256: 901320fc85a6dd6775644b988555a84d03664a2463099a1a806c9ecdfc3855b0
font_02_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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