Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d6012e57271f9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 18:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac02529c1a667b391fb9b4ff08aa2be4 SHA-1: 60ab7d48b106d075c88c434c2626fe2e0f781a0a SHA-256: 957d6012e57271f9a70edda485716be506ce6c9c1b7a48068dd98e531b4f1d03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=the+moon+is+a PDF link annotation
    • http://duquenne-moteurs.fr/webroot/upload/files/98053202681.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b00b1902412e08402fe4c86735d3f116/fupamavepalukudabisimi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1610717e111bed---fupitepafujinalidegikiva.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741c2eebf98---60168487263.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/basewipejuji.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1ui5sicbuca0s13595squvqbn2/34741089242.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/69479591099.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6b14d7b8---xodafavi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/mazomolunirawexenit.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098859181796---30356875161.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/lubumujefolinuxiletemidi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609036d556ee2---29008701221.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/31820962334.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/temogebefipasuj.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/danag.pdfIn PDF document text
    • http://mp-journal.com/media/file/bumotofarikudemazigoroji.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/14105963427.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/53945885366.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/493b158c54683c87a81e8ade8710aef9/bosivoluk.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vovaraleza.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/820fa4adc805115c89cdec2c0070ba65/dukujikekuwemazo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa8524023a---silajesopimi.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/82gl1l9vebkpovl39bnn7c4k3f/58217635913.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1djcrl6pe6naijlrb9c1qpnqj1/gemujudebin.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/ferixudo.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_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 16836 bytes
SHA-256: 1743ae6ba39c339bfdf102ede0c6685ed7f4c47685d01c9ea022360e98464907
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 10092 bytes
SHA-256: a29744050b8d09f49267ff858bf0d0003108e78c5cb3013f2f64af5398082451

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