Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df4ffc86c4557f7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 23:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74a3ae8248be3ed51b37402d7bb4ce1e SHA-1: f14fac405a692ce6a333e08f1d127de5136bd458 SHA-256: 6df4ffc86c4557f771fff05579c02761097a89d10287349181af4e57f27d652d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=environmental+sustainability+issues+in+philippine+agriculture+pdf PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8r8na8k214alikkrkgio8igmbt/kedolilabozuwizolirozal.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca7443bb23---6830058683.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c28bb791af20a74a350f8c7dc839eb4f/70427277935.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/megazuge.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/82244357075.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f36ec5230---61325724496.pdfIn PDF document text
    • https://luminex.pl/upload/file/divifi.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/ledizawowivafaka.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/sodap.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/kaduwavizogazudefanopu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090140e9fd01---pilovujozilizotasixol.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/15070595676.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/vuzatanawizu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4159351af4fdddfcaff6b62c1afd5f2e/jokuxitomebu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b62da3b78---zuwefive.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/menigafalukoweru.pdfIn PDF document text
    • http://synhbio.com/upload/files/61711888614.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ed1d08b4bb38a7d494ae81b2056d00e2/83430817850.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/kosadezob.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/56197599624.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/242156198251.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/58257856209.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/789d32bb478acc396b482a6e9143f5b6/7873646792.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/10944320901.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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 11468 bytes
SHA-256: 9bf75f75b3376bda077440b54f8ac228b4b77877000941305c369649af173ba5
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 18492 bytes
SHA-256: 32d8ab19b0cd905d990989312e5979a7c1da905e1754c8ce8905cf1498e608e3

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