Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d250c40c637dda…

MALICIOUS

PDF

92.1 KB Created: 2021-08-04 02:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f57b26f91eb41fe2a0c0f56937342c1d SHA-1: 4dc46b1171b73072b7d61749cea00efaaecb35e3 SHA-256: a0d250c40c637dda448ce2579f17d00bd43024d29c120bc05d9961a1718081ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://shindah.com/images/ckeditor_img/files/tigagebobofavaxokuzaxumi.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/16975236286.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e463bbd7cabd0a68d8b30c7fd1f5ffe2/kidogoguna.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/372eb6781048ad4623a49446b3b83482/nupitabeva.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fiwanisotonule.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f1cbb919---sepuremadegowotevefoda.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9b084ac81c2a96012082a80973bd1fec/retukameneveje.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f692613289---28858772613.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/28856115501.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d626f98a7c3eb19602ba74fa571ebb66/jojigud.pdfIn PDF document text
    • https://filetorme.com/upload/files/pufenudezononamu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e4de9114ba7---39935552278.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/mixakarivezagisamuleze.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/nokenejefu.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/numewefodidoroduxipuze.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/83551658434.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/garozilozudoxifozigemuras.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///baxidifakifuburube.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/dibufenetepux.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/nopdeta5h31uj2c5inmi6dv0qh/93247712320.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35f11d6f5---91361196540.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c512261188debbbbe81cbd00c1b68a55/20827397796.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/14816151944.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/lq7kf8he31oiak0ceegeag1rqg/kivofilomuvew.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/dojawose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=recuva+pour+android+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10496 bytes
SHA-256: cb15e4328071a6f7ca5af0bc2266f7882bfe0092bd8a1b562af996ab0e142387
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 19172 bytes
SHA-256: 0346407661725250f9c17acbd6bc453f4b365bc2dbb5ce01712fcb0addf795ab
font_02_sfnt_off00013da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 2688 bytes
SHA-256: 8cfb89bb52be2e50a25b7183bb44c8c8d3b95106b64c7878e13b26349f4c05b2
font_03_sfnt_off000148df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1