Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93b13aeac0f36f7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 01:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88f215000c726c5dcfeac51505f78a5a SHA-1: fb5f66ae6087b281a46182c394b6dc876c3645f3 SHA-256: c93b13aeac0f36f7bb59e789dedbb454e071673b68feedc9bf0c16c67adfc97a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alakharia.com/public_html/userfiles/file/jijumuvesovasime.pdf In PDF document text
    • http://colafranceschi.it/userfiles/files/jokodapome.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/50b6oegnlc836rtjubtli0ce46/zisubafaxaxomosajodez.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/3qb74ihgv6dd51t40kae9nte03/doximusugolinemazu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/xefosegelus.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/sudebudilotavufusuzej.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/80652746659.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/31674193572.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2b9a6574---sofovasavawojojozoda.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b53e9696b---gidego.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/22203754091.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d23160f9d---93362291426.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kogn317mt4ceb9rvadjcsr186m/wokaporega.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508171015_139295779.pdfIn PDF document text
    • http://jfe.hk/userfiles/50181029046.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/fefoxiribizeduro.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3cabc5509---26284365320.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pulokesudizopugozo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cc45b41f---katumafusofenovegiwes.pdfIn PDF document text
    • http://jucal.es/images/file/vejesozig.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070516580077.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a534c23a7502fa70ce16eb5c0fff86a0/paribizuxuroxetid.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/41786647022.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kttnmemnu26vvk7mq4foeks91m/zofoxitapexunozevaz.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/8975893881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2020+national+budget+philippines+pdfPDF 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_off0000c37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37D 11060 bytes
SHA-256: bb89e3e22786b3b488cd4761fa680971e81bf006714e4a161a18b40cc611b186
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 16684 bytes
SHA-256: 99485eda29976a7d26a46626f7e2ebbdc089be8accc44f7a893b80b976674647
font_02_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1