Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea27f94046e9904b…

MALICIOUS

PDF

77.9 KB Created: 2021-08-28 06:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70d76d18e0d99303537ab423c3c30fdf SHA-1: e9e0b20164bd4207dcee347d74e08b7678a4a109 SHA-256: ea27f94046e9904b195f441b416338187d7d703865e9e318398c3a8083a18e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms with UTM parameters, suggesting a phishing or spamming campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=100+baggers+christopher+mayer+pdf PDF link annotation
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/mokilazexupiziretokewane.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/duvedejotarolimel.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a6e3a11f5---24207821081.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210805_0190882A3C7079B1.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1909d45efd11cd3738321acb9ddc9731/derore.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3l8uppgu4748va8q5buc6kmgkc/bebetiziwasumixurabiduper.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/peregarolur.pdfIn PDF document text
    • https://eventaipei.com/upload/files/15726074437.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad4d36fe1ffe5fdc33a30c12b5ac4d2f/60252355351.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/27172917842.pdfIn PDF document text
    • http://kotolantopeni.cz/file/kopeval.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/46017444204.pdfIn PDF document text
    • http://accronline.com/userfiles/file/49612353732.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/97142323230.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160727a38d1737---nipukazatosebokur.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/dasupunogikujawanepona.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/xaguni.pdfIn PDF document text
    • http://hodori247.com/uploads/files/rivuki.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841077659b7---49997292601.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/nifevigojaxidi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d8608782---19534452460.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b8c89feae28783d6d3240e9b646db1/19005601854.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8e9e06256---37975756941.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_off0000cb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 16992 bytes
SHA-256: 95f4f331073cfa0b9b95602002bf7ce64524617285b00eb072ea1d1d3fe1afe0
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 11248 bytes
SHA-256: 7f0e8fad851cceaa8f8d66b3798c5ca3a7ddfedba20e76e00d3c9f0b1abf621e

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