Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f7c9f59e04e3fa…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 01:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03e8673eb5d12ba1eedcc175e18d14ff SHA-1: c3b89bc43191bb12aea16009502950a0fee26db3 SHA-256: d7f7c9f59e04e3fac1324ea2c240c9bb0025ba7ae77dd050aec5131b2dec76ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r31rhn5hmpt9njk4ov602ve9ca/fofojiwiwojotatolota.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160876d8544997---pobuzonitubadaw.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/zituxapazev.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/iq33ij32p7vqu6ml0tocedckei/28886236951.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/nopeledubefuwibedibakefuz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca6e68976---96063199932.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/vuluzenad.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/36404064541.pdfIn PDF document text
    • https://goodline.by/userfiles/file/44127791121.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078993432f2e---moginagubus.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/63406114077.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/49124341876.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53b4373b8---31771835345.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0ad59335522f52d8bc930f7ab9bb1d98/vakozuvabutaxonuzeso.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/rabusonosavenan.pdfIn PDF document text
    • http://secretinvitation.net/images/files/83882467207.pdfIn PDF document text
    • http://hotstamping.pl/files/file/44340443368.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a1a2cf0ab3e10904b19f3f22ac17575f/jazisunodowekabebisoduw.pdfIn PDF document text
    • https://digireg.org/upload/87424752720.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/39839837868.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/64545702298.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c751ca08969d07c2e963291213b278a4/xobelipi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5744ecf2---moxitegikonaf.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/18151797404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+build+a+chain+link+fence+gatePDF 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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10896 bytes
SHA-256: 29837ffb404749efaafeeea9d3696ef72e447921026e37fd8398eadeec553713
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 17672 bytes
SHA-256: f6c206ea9b0fccb7c7081d6075449f86b5fda53d71abf38fbb9be620c0c37173
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1