Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d80f84f1565b577…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 21:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22091aad31c6074efeed7ead62945eb0 SHA-1: bde3331802e8e0e923d02c4bcf3c01b1ab2ecef8 SHA-256: 5d80f84f1565b577e34ee0bbc2f25e053ecd62100a9a53c7cf94245e05f6a522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=free+printable+multiplication+worksheets+for+kindergarten PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608152127cf96---11911079457.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/80385432316.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/48a8589cedc55ef8c87d4406d9bdebb9/51858222182.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/79049537980.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875b154bee---kasemodozefudanirepowo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/juxezugopudubirunidezoxa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121832dc16---66594609989.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/48323357233.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/18825787486.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/vevufegijiwuwenobefitemi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69bc012bd---wujodikewu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/jideradewo.pdfIn PDF document text
    • http://mariancozma.com/_user/file/rokigobuwuvaru.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7aac86c3b---xigoforiwivefizakitebusik.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/37622752820.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d89cac1442b---93143512196.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xogebubamipu.pdfIn PDF document text
    • http://happy-land.hu/editor_up/paradorowazitoz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48b842cd0---67002584043.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/65790887244.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/36079899941.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/99649467868.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d4tvt7bs7on7eumqbssbk2b924/86631046846.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_off0000bf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 16276 bytes
SHA-256: 6f8c9b5915f9885bcb128f72538a69a851990204356bcab04d79270b3309b513
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 11460 bytes
SHA-256: 44862e0b8bdf7f04d9164e6132de392a10d68e4564879ba9cc5113323d0777d5

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