Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6c76acc087b6ed…

MALICIOUS

PDF

126.8 KB Created: 2021-06-28 05:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a49c03f9d071f0de34a7a353a77abe6b SHA-1: e8fcc3bf334e245e22d6220b8e37c0ec45b129a9 SHA-256: 0d6c76acc087b6edeb4f26ffa3ca8b3e7ac8adefe5e759180f1fc580076dcf45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

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://strandedtattoo.net/file/piwenedeporixelojuwu.pdf In PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/66382004267.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/hats89bk57po3n7q2n4gppbq0p/5047866783.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c115026d0c8---15510940650.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/17017382455.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840fd30e69c---kudulusabozugof.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e75263828382c11119d66011cb6f10b8/60815954463.pdfIn PDF document text
    • https://iwistw.com/upload/files/lixubarixunufiwar.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982e67cb83---badoramopog.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27ca33e0c---92036268430.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/62457851878.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/vukizas.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810aad3192e---57104651293.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dc3234cf682dced55c07636539c29831/68767489130.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/44c0f2eb9a7adeec281378b9a61a6bea/38925001431.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f64d3d392---nenubi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e667c2241---11156065079.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/bufakalusimakilonalefoxa.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/jokivanepag.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f9dd51fa---posoretezapu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ada4e84ff8b---95963288515.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/parimoxexosigaxope.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/21331452771.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ff26e5f032816453e2db4fd305acf0b/pesazetezamaresebi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2175e6406---xawigajanolufimerubi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/kipuselexev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=skeptic+annotated+biblePDF 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_off00019271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19271 16832 bytes
SHA-256: 339d34717a2326966c6fd028260589ce2394a7ca32321bf20aa1503c4c1ba50a
font_01_sfnt_off0001be0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE0D 10544 bytes
SHA-256: f1ba3cc2389fddc874ab9ae622efdd25a05c43285d8bcac866c14fb67b2cd199
font_02_sfnt_off0001d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1