Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d9e7d4eff7bbdc…

MALICIOUS

PDF

89.7 KB Created: 2021-09-11 15:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5b80bce8bf73c2c68ea165c4894dc23 SHA-1: 616ae15a830a51dbc5570bf73d48ca0ce895e09e SHA-256: 25d9e7d4eff7bbdc6bbe27626d01e5e1a9da4c2e1a0cc0aea8f1c4ec0a07b22c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cremyco.com/app/webroot/docs/file/35514795174.pdf In PDF document text
    • https://smilaxlabs.com/userfiles/files/23362986789.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/sopusap.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/83922747002.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tafumanix.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/3934826712.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_F6A918417F213DB6.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ff87429b---73538697561.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/14693905868.pdfIn PDF document text
    • http://ave-france.com/pics/files/31894463899.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/65929059932.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65a7d391b1004796785ad660466dfe5b/48189694749.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c3d057a2abbb87f0bf40b50b8050036/puxavexosikisukeripi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c9a4396904ed1a4b4d3c16a52c0abfae/91724909370.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gejaxotixatotik.pdfIn PDF document text
    • https://melz-feu.ru/upload/43850339772.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/dipakenetulo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/bugetepefi.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/zotuzoliju.pdfIn PDF document text
    • http://scsytech.com/upload/files/69669108405.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/jezigagadip.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/saduxesasogeziwojexo.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109080410177166.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/22064589750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=boxing+live+today+freePDF link annotation
    • 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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 17120 bytes
SHA-256: c4363c8ca58fc1416602a40e733314f261f5d86961af5f92e894c4825900011c
font_02_sfnt_off00014164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 10696 bytes
SHA-256: c90b7c7e14395fb14cbf875432b63078aafb5e1ab872ed5101b2d86d0ec57770

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