Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93abb188bcfbbe9…

MALICIOUS

PDF

74.9 KB Created: 2021-06-18 20:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a81ea5ab26a46abe2264410e6452b748 SHA-1: 47cd551c09cfe4e18ecf7f1d11bfc3fab303f2bc SHA-256: c93abb188bcfbbe9dad3dd06978b550b5a4bf2511f650ecc971996485df2ff3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which host further PDF files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic firings related to link farms and compromised CMS uploads support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=best+website+to+download+malayalam+movies PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fd06ht5b5o022cv34gnbtjak32/velutuvubekejidivuxe.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/3114741927.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wilajefijipopep.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/28399744154.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/12f3d5c7475b477b3fe99f0cb3459886/22366379052.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a93145c088815e5e8784867d344e16c/xonukedulelebo.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/firemikegojugafomifu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0d6992f0323199b61352c424e8863c4b/kifojinipozetadizum.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/vesalemu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/93374102984.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a20b9e6e5f55545af440d4bec3ccfe20/76231223234.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hfrq8e3ph3qqi6ojfv4495i9vi/7122437520.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/01e329be405a6a055668009339a8338d/sagefolap.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/adf85f6d40f6bc06fe9dd4fad51b64cf/jajemefe.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/52451727226.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/61537011029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 5316 bytes
SHA-256: fe4bbee627eec19a55f896ccd9ffb39cf16b96a7b6b35581b760e53f6dd52a06
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10832 bytes
SHA-256: 612406066a296b0d3949a1dab766d94dcbb3a1db4e5444998fb582bc38d1a502