Malicious PDF — malware analysis report

Static analysis result for SHA-256 96703597aed2dfce…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c37620cf54bf00c5f3f088aa7bd3878a SHA-1: 9356a24dad868187bb05a1627c855dde78c75941 SHA-256: 96703597aed2dfce78c5c6bb1bf345b0a99d58b4dd262c1dc68f3ba040674fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=prova+auditor+fiscal+da+receita+federal+pdf PDF link annotation
    • http://quaint-house.com/82119249943.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160744b71a111f---tunuwaveberakaxunav.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3c1db92d7e093a2283ede0cfe4d2986d/jomisarab.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cko47qsl0up5hk4n9to1t6tngr/26418540714.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b874315656---84542936249.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/tirovujakegejamasagere.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/7991617796.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/46483838394.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/97700661522.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vedeni.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/gumuluselef.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/99778702170.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121794cabb10---wavoxofepabojiwavagat.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/jupelamikovalolapikoru.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/gag23qju0ouf7cogphao727b6a/lesorevokevidejema.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83574835---mojewatefepuxor.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991b1faba5c---82495172948.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/28750885075.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xabebog.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nulakitejupexosexeme.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c01341364---giwiv.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1a1c12e7---2237974266.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1cef7f44eeb80bc2e42698967ba843b9/korap.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b61c07adfca26778c2cd6af28f5bc14f/18397459604.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbdb1ae53---66986483602.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_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 19024 bytes
SHA-256: c42f77c5f8cf95abd2cfcd22a199d3e12f4256a5ebe46033fa982b3136bbf041
font_01_sfnt_off0001295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 10676 bytes
SHA-256: 174c6b5ab5982609dc04af4b27075e2468e305af503a3b1917b6345fb8ed3880

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