Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd6731df7c9039a…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 01:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d5766b50c51efbf1262b89095a66c7d SHA-1: 3b6ec932b4ac7f8e5033cb623783199ffce9bfb5 SHA-256: bdd6731df7c9039a61995f2a00b9334c92e8e8e9c031a54c631238f3e74cae96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the file acting as a downloader or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=how+to+find+the+answer+in+inspect+element PDF link annotation
    • http://colegiosantarosa.com/uploads/imagem/file/43603838685.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/37433753823.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/oag6ungn243m6tti3u2chjmnn4/74461838183.pdfIn PDF document text
    • http://decalvanphong.com/img_duhoc/files/28202794210.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/buxuvog.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ulj39jl5gu7j9uqonh6jnl61mf/7475765124.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d7f62257---difoxutotugavidowoje.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e09f58227---83215824414.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56244542464.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/7775966652.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e21a3c236---81547106560.pdfIn PDF document text
    • https://birotex.rs/images/files/pojixizoje.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/78744635549.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/83847746906.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/00f830a7ca152ffa92ec323f897ed477/vewedibewixesozupumupo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513ed5961a---62228288097.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/savaneja.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f99c1755f---bodibarevezonelosid.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4mkc3rf5sko2s7mjssvhktbv49/tiwipevedov.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/domepimal.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/pakurajakapanosukuli.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jajigimilir.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/74473200938.pdfIn PDF document text
    • http://cke.hk/userfiles/10781464395.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/25215735040.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/19032940965.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/zugonotenipepuje.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 10960 bytes
SHA-256: dae226a880a03d35c08392e6fd8413bedde53346249b714b1a374e18bf1c2476
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 16768 bytes
SHA-256: 79a7aafe8531e2910cd98f16624697484000768efbf9689fe57ba23b832acd32
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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