Malicious PDF — malware analysis report

Static analysis result for SHA-256 8445d53da7d754b0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 11:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 806a3f66f117156ca9922d023f7016ee SHA-1: 987fbb99398069dcb041062b5574d04554d3c563 SHA-256: 8445d53da7d754b059c71e13b2a1b4131c50a2d3f4b1ad1becc2e34c9c14190a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=happymod+official+website PDF link annotation
    • http://kaus21.com/userData/board/file/xumipomerimekuxibowu.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/55305396505.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/6931084767.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/25636546872.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/27706084291.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gifegomafojobekumanoziso.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/164064793861455e340ff51.pdfIn PDF document text
    • http://blgjad.com/upload/files/82084250541.pdfIn PDF document text
    • https://grandegroup.net/files/silerenosa.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/9916968068.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n9gbd4inaf7giq4det1cpuhn0b/32074314715.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/tomirugu.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911133141_1505569968.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/rajedu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed47cf782---sejepovoranitewelepumovad.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/19223171566.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/67925705093.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/65924813999.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/soluzoxedizeve.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/97331739381.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/73f5d05cbc6cf122281d0ef58bf85a78/nagutuvagugawozufexo.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/bakurodejivonakuwax.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/97052695374.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/24676079910.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76727978148.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_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 17972 bytes
SHA-256: 9553ba356d971904b74e9dbbaa8a38c671cb40dae7ce79b8b8eb57046fac959b
font_01_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 10908 bytes
SHA-256: 91edf0dad3a491c0ff91ce9962b5f13691625ce1fd616d75bf23e52606084d5a
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1