Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd59d2ade29ebe3…

MALICIOUS

PDF

148.6 KB Created: 2021-07-05 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 04ed311082f981037f43ac25dd03ef35 SHA-1: f912912dcf0e5a4887c2a66f1eddb3bac46e543c SHA-256: 5dd59d2ade29ebe3d377046331cc83b011d2a6834baeb5e8ad6c02d281006e44
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing sites or malware downloaders. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f89c54998674f2510155f318ed6141f6/38850776423.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0b3b20d3---lotofakajaruza.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xizelofisivovozijo.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/28683903045.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/41255104979.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/790408f99ce1c31a7c0ff9b7cc52ab81/32923778446.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v2k5d48adir6l1r46b2caechc0/rujolefaligixawigopufate.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nivagubozuxowovelanenu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/860bcf90131587a4776a41d18ccd9801/vowugalifizaj.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899f2ca739---17481567749.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8313b201a---338250681.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821e3b216bf---34392462127.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd78640c3d3---86136515547.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/45009131727.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6d835761---12069663023.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/86kupqb79a95abcbu445vdn143/vonubufix.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zifukiwaxifaxokotep.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e723907cd793cce7a256203dfef00e89/gusomusaja.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/76593484560.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/e525a31d611023ca14bd3da88720a6e5/kakogatakapubi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/16349298138.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/15515946854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=look+out+here+she+comes+the+woman+that+i+love+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC8 10912 bytes
SHA-256: 4e399796c4ccc73feb41b47f6f24e261d4d4b1c9ecd184532c5c2ae518c23270
font_01_sfnt_off0001e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE13 23904 bytes
SHA-256: 9df244f74efaa251c5e3e04a525fe83ed2e85b3930ed5b6ebfd1a880c1ebe3a1
font_03_sfnt_off00023675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23675 3356 bytes
SHA-256: 450cf7fcd638e9f2ab9e925b507d09eea9dab3238814c0d384a717d7aaf13e38

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