Malicious PDF — malware analysis report

Static analysis result for SHA-256 37905a2c6bc60c99…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 21:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4f37cf95eec5b3f6965681ee835cd83 SHA-1: e93f9b7ef835ffacec3221b2441b22a9b5b64c5e SHA-256: 37905a2c6bc60c9900f4b8f10ef486885647c2d3746f3fbe7bb1dd4649164f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to phishing pages or download malicious payloads. No scripts were extracted from this sample, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bluedevils59.com/clients/862365/File/71953106537.pdf In PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/gejuratapoguvanetonod.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4aaa41806d675d80ff97b62b0401cf00/17986533531.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/65f2f2b085158c4e3a6e9308d7d67164/16724444427.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/piwej.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/47749025928.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a693d53debe---29755966308.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/96347017671.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/repavisuzanuxiruwowogo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28216b0eb---tanizizokaxikiparaka.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77d68be4a---renoraxamuxawatojoxozon.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/nenumupidabubo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93fdd9509---raxuxabulekowajeridabudat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138ee2ea92---peretokutofuruwetemit.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/61780366052.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/31734028223.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/bitojixabijafomukowuwis.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5065f55e08c9359714c2afe3d3800223/tedazamibadib.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/dumexadadujumomeb.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd76e3ddb6d---2903579552.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/70540170704.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/wipafe.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd31623e83---zilagadunowukenofujiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=livre+chauffage+central+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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 19400 bytes
SHA-256: 78da68eb35abc5f9ab60cde8054e288b4fee05f9ae58f5a2b7063917cb766d1f
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 10736 bytes
SHA-256: a66da1ea4c12f5de967783bcc469fe2b91566caaf1d3e4e6d91191c278ff8e29
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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