Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb0aa9387f2f02b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 23:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36c55b172f61d782c3cadd6e94e2a68f SHA-1: 7bf65e9b346a3381d03b32acd54a3c83c7355268 SHA-256: efb0aa9387f2f02bcb1de1eeeec4933ecd2894f754119990ae4bae8207ff7957
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. ClamAV detection as Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://manavpublicschool.org/manav/userfiles/file/zazanotidoxotugutobejirej.pdf In PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa4fd7678---regeripigeb.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5e8d5dcd75b42797ba44410f8143496f/janipanesusuzawibelofu.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/jirimimi.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/58736298078.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/63564776920.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/93605016093.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c61c2a11fc---3379218220.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/93283729680.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/41893924206.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/12991682339.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/51069183631.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/635c97843b012039d78e5f6dcae3fdc0/13572991511.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1480ff96cfff704841a433fda5d5c49e/futuralojimowuwex.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/xunululuxarivoboge.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e441d5dce7f---47975404489.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zetekewajale.pdfIn PDF document text
    • http://ned.ru/uploads/files/mazipizafof.pdfIn PDF document text
    • https://tigapilar.com/upload/files/murifepu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0530aa064---xomaraxasi.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/1bf0008b78c9a92113e9080a96679534/depimejowokugefixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=oral+cells+and+tissues+garant+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_off0000c8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 18056 bytes
SHA-256: 2c81c4e234900ca9910e782946315e27444c152703c79c05635da97a896fd5e6
font_02_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 10800 bytes
SHA-256: ad41db2257bd1f79b73066360d3f4a7f93c7939df60cd722c5b017469d38cbeb

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