Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef60d35f6548980…

MALICIOUS

PDF

76.0 KB Created: 2021-07-06 15:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2188041836f890f56e7a492443718a33 SHA-1: fee6ef4212fff235cfcb6c3f0ba739cd1727da92 SHA-256: 3ef60d35f6548980e91444bb37e53c751ca4c17584d9038e0ca465e9cd96cbbd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pistant.ru/uplcv?utm_term=insomniac+meaning+in+bengali PDF link annotation
    • http://fine-cottage.ru/userfiles/file/sinumos.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcfcd0df6---savobapadeje.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/gilenaru.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/soluxubiwu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d9774cd0afa74d1c20e6722fe2bcaf0/lamijenoketufad.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c0002b4c2a5b9ce55922bd1717de2edb/duvepuwofuwogitejoli.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5c73b36c---vivanigakubafotag.pdfIn PDF document text
    • https://fallsplat.se/file/dovik.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/vizixuvagavo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vifarulidozul.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/12527520574.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/42523559833.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d13423fc5---48353660349.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jujegokada.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/temurexifed.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3670c7321---roguboripuso.pdfIn PDF document text
    • http://cichanski.com/Upload/file/somubep.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/nowipejidafon.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/271930e38f3e51b86d74f7c9a39b7dfd/gelekutizikapezexu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/j8hfaoiv7e53ppi78dd5nkvo2t/89905477218.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-1/20210601172555512931.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/977dd2fd34e896e4be4cfa0b32cb5330/dajapibanigiw.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607547ba10aec---78121306986.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/33d17d1ccf769bf903cdf01f02ef5183/19894824670.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcd00ea62---14520877263.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b917e749fda---livadojitemapewufuvi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8ca02f99fea067ae813a0d3bdbb29df0/gimuvodagelinotaf.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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 10468 bytes
SHA-256: 35e683bbfe002809fa7152c332fc88c16632dadfee8aeb63f425d3bd234ba9a8
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 16136 bytes
SHA-256: df2fa6557989f6f60e4d60af6b479b9982d4f857b9c12fb194932971c2d73a1f

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