Malicious PDF — malware analysis report

Static analysis result for SHA-256 391a415af68dcb05…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 02:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2679d2a7289ef9e4b16ae227dace6535 SHA-1: d27aca718c2404c15a9d36f864ce06b3e45578cd SHA-256: 391a415af68dcb05e26376fff2460e5d7595744764866df82f9c98822c5d5d8e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of embedded URLs further supports the attack pattern of luring users to external sites.

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://infrive.ru/uplcv?utm_term=famoid+like+instagram PDF link annotation
    • http://ctcinsulator.com/uploads/file/fezugunazujaziki.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxazomunavesasuxi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/400c5fb979b8e46b4bfa4b6c1c1f9833/zapotabidajebes.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/49867513225.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/gitose.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/97763897150.pdfIn PDF document text
    • http://minerva-collection.net/files/files/93225672244.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/fafolapoputaludajufazo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c65f52936---navizexolerekirorukobux.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/86b85ef22bc0f15af13f3484c07b07e7/nazagaje.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zaruko.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/23672356653.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/xijozopekewa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eab1945ad---jusurotagibanuxagiwin.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/lumitusewajajowu.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/tegukebuvinuvizutokama.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/37429069584.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/soropavisujititegone.pdfIn PDF document text
    • https://mkontroll.hu/File/miwidutu.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/18171758741.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/lipanoteginumepasalitor.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/siwif.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/faluwu.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/gojoleragumevag.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/92841909226.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_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 17580 bytes
SHA-256: 450e854041affbd482c7118fd8f21a079053c43b3def644b1095b54ddf476e9a
font_01_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 10660 bytes
SHA-256: 710b7dc996e93e594d317e3690e1ea60e9d1e465068182ed44df1612fc17d55b
font_02_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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