Malicious PDF — malware analysis report

Static analysis result for SHA-256 3349b3ba15c12fa8…

MALICIOUS

PDF

86.5 KB Created: 2021-08-25 09:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3635e98124913abf0f4baf4c00bbdbc2 SHA-1: f7b37512cf63b5b700a74b00dc5d569960a05eec SHA-256: 3349b3ba15c12fa8fca01f1e82812e3c3b64c7c7036654871d73edc3f8783fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with a lure document designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crysiq.ru/uplcv?utm_term=mode+of+ungrouped+data PDF link annotation
    • http://piemonteforyou.it/userfiles/file/xipadiraboworeraji.pdfIn PDF document text
    • https://linoforti.it/file/gomewekolilija.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/vizudazebolorise.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/fadubosol.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/95556296094.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9587cc45f833acc01e25fa81a6f32508/6645458116.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/86980617655.pdfIn PDF document text
    • http://roocenter.ru/upload/file/fanil.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/45161667238.pdfIn PDF document text
    • https://aedwea.com/upload/foto/34866427770.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210709_DBF7D58BBE68B6FE.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/60443750432.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8971900f52---59290614989.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/69232825905.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sku65llk6n7asjmtt9l3hc07j8/tipipixe.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/43e67788759bb80a859444da5aa6811a/58623811285.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/20929577494.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7fdca270---88431404606.pdfIn PDF document text
    • http://recrute.fr/files/files/pejorekunidowetoze.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/35810817358.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcc93a67---rorawizobuterilejugewir.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/lebur.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/koviwafuriwanedulunojopi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6555e231c---vikinikekejawekumej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10460 bytes
SHA-256: ad4e887c35ec988e2b0071a440993b54fdf90f21b1924f1d9c802035858aa315
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 17100 bytes
SHA-256: e3fd767f3d44ff4786e00a5e2402fad996f93e19159f01fdbc6211dcab9cbb2e
font_03_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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