Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade6a49712b55bc1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 21:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48666aaa06d53718ba35b03f516ac513 SHA-1: 80b5cb8871661f882f13aa6ff932ee3df22130c2 SHA-256: ade6a49712b55bc111a41df477d7f8566a3d94cd6fcd8696e227fdbdff43d66e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=gestion+del+talento+humano+idalberto+chiavenato+pdf PDF link annotation
    • http://saringkarnwood.com/UserFiles/file/12471645158.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d54f29b3---68564387111.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/palokedoxarimij.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630950799.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdaa2e911362282c2b9f75d471f76f45/demoxiregaku.pdfIn PDF document text
    • http://w-mill.jp/images/file/varabivexi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jamotuwikugajure.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/69405783475.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/86264366096.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f44c50c8---33289435164.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/82784928637.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/loxeva.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/78273758259.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/46784710273.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5eea1c993---67492417764.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/javirokagugoleropasofenu.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kufedelagisa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lizibizijalepikaderumiru.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/52199100727.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/73820019868.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sopipufowekuso.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/60699174173.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/vusixogusunudi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pajikewup.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/nokowutik.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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 11228 bytes
SHA-256: 48f9311571ac7725e8aed34fb4bc08d70171ff68b5d6c67a8efe63b2a3bd6f60
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 18248 bytes
SHA-256: feb1c6bd778c15b2802864e35defeb0683918eb3ae6382dd745f5bcb9259cfe4

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