Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a430693c4b6e575…

MALICIOUS

PDF

104.2 KB Created: 2021-08-16 08:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5d0550c15f34107337861e5f10022190 SHA-1: 7d012637c86673d0b213c3a1e0ac2a70be661005 SHA-256: 2a430693c4b6e575b2c4a0d016845b6787dd00c93ea792b865960d9f6a2f4347
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://foodchemsino.com/d/files/16102140277.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1a1b0fa24cb88c825b5438e10af1b22d/10620759171.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210611185638.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/ruzajatale.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/43544044219.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080892c6f491---juluzogisiladof.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083191c06c39---lovinekejonolut.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/25664047489.pdfIn PDF document text
    • https://egca.fr/userfiles/file/23754217697.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/644fd9171de94b1f4c4a308a9d8d25fc/86106912995.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2e05e6b285c428ba537d1a56aa26c6db/919335491.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/nurowi.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/44876402911.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/734b1b4f8737bc00c210e45122c7c614/29240532678.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b2cbf7e0eb5b8ec6179159e8afd30f9/72519607602.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/83509585946.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608247fd17ea0---3395642241.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/gojuzapeku.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7afe08fe---pigudokebigiwasawev.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/9205825982.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/72420760199.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84437e133---rusotunipurulivipixamim.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/xesakaf.pdfIn PDF document text
    • http://rc-modeller.se/images/file///gedaletu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=planeacion+de+instalaciones+tompkins+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14751 19340 bytes
SHA-256: c56eda3d50b352826b79780f368c489631d3c8e2a2d82a1b46b766b980c321bf
font_02_sfnt_off000178f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F6 10860 bytes
SHA-256: 248a947bba9dc2221cd1b891ef5b67d4bfcf21cda0d003cdc383de0534484b09