Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cad48397040b798…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 18:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f655b7c07ae390735021057b199936f3 SHA-1: 56a5fa3cf72d93b46efa5943970ef40c8c119a9e SHA-256: 7cad48397040b798bab7f9aa27024efdb09d95f6c515d13a1f92e5f94f960371
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://maskaevlawyer.ru/userfiles/file/litigegunel.pdf In PDF document text
    • https://shipnhanh247.vn/asset/files/pilimidod.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/27428340868.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/kupinobubanofigixu.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/86284439010.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c871c14284---15347045532.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/nikokudutobopusaximavema.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/95963482409.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/julodapojaginagojot.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/97567508984.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/59418587276.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6ae9f6e54f9580aaa4d8704f6fe0d4fa/93049251398.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/befugukajorobagar.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161331b5af1f2d---wixotaturebirajeworom.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/54883433449.pdfIn PDF document text
    • http://crm333.com/documentos/file/42376847841.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/11515496534.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/wolipevabovod.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/70424403610.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gaforepetevakuvawejev.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/liwuwibige.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/39197970855.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161304a629fa3f---degekimuwenim.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sobawopalovadowawalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+walking+dead+10x09+onlinePDF 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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 19136 bytes
SHA-256: 4b5e9c1861e50df8e3fb44cf5bc0105d247cadafe9b857cf77769866b60e0472
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 10748 bytes
SHA-256: 82b9c206654217b00ab80d4385b7635a4e49957720fdc5c0a30c3c37e8d7ac20

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