Malicious PDF — malware analysis report

Static analysis result for SHA-256 2391515aa44477b5…

MALICIOUS

PDF

102.7 KB Created: 2021-09-06 05:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 236ae594be6e74955c3b4aff145e67da SHA-1: dab3881da69bb9f777b7d224cf1ff967f6681f02 SHA-256: 2391515aa44477b52da8e01cab9af94479532096f306e9423188d2e7a1e53265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file utilizes SEO poisoning on compromised WordPress sites to host links to what appear to be further malicious PDFs, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms points towards an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=sylvia+day+reflected+in+you+pdf+download PDF link annotation
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0950d6a5dcf4210b06423355552988d3/48516026983.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/40493493370.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8622bb0a---20437430721.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210701_30FA6FB29F5A0E52.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/gajibefozusesajo.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/susavazifof.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b411780a9---fuvoviviju.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76c4761da---bepovedorevaduwivugukujo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b6d5e3f1---defumexarevu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c343fb3372c044bda9d574b2a6bbd73a/56797238070.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf813c4041---44199864695.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/logibaxolomuguwunivas.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/35400029147.pdfIn PDF document text
    • http://parfumland.sk/upl/beraxajer.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/jixobumujoxitu.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/xofogubevutevuda.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/molikowagaxanonoge.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/bowujig.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797919e5781---83025602477.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/12352875748.pdfIn PDF document text
    • http://bjallstar.com/upload/file/51212852664.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de9464936756d55708df5283fab7c58a/3976195770.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/61c259ddf6c239c13e3c2c32524963a7/43750752991.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108365703e51---wuteraxub.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_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 20452 bytes
SHA-256: 71ef3041d3bdda732511ae3865e215bc007a7e6861d72b42ca75748ac04af7ce
font_01_sfnt_off00015b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17382 10884 bytes
SHA-256: cdebc90b7bac306beaec8f28a00d1f9fa35d801739ae73a7a0049b560497380a

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