Malicious PDF — malware analysis report

Static analysis result for SHA-256 7412078dafc98cc5…

MALICIOUS

PDF

78.8 KB Created: 2021-10-01 21:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7bc6380b8ff40b2608ea2bfb3b934086 SHA-1: 4cd0cbda173d49ea9a2ebb3716e991ff26775a8d SHA-256: 7412078dafc98cc5408ee69db66b070670efbc93a5ef6309fb643014c04b7a57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=samsung+m30+firmware PDF link annotation
    • http://flairpens.ru/uploads/files/73926732035.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/xisirovuduwifedoxojubosul.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/ximegufekujobenibelazi.pdfIn PDF document text
    • https://atavio.ru/files/file/42717014091.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/45756845093.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/70828785659.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab99262e6b---19499629628.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ec9eae4f5---82173423547.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1665a9fe3635fc862542907612fa5c98/8619965395.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/39278791312.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/ramiminegoro.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/ligebukitipewumozavigonuv.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/28552050396.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/numuvoga.pdfIn PDF document text
    • http://zkpower.net/upload/files/fakagedozun.pdfIn PDF document text
    • https://orangerun.re/photo/files/54935548896.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/nukumizepuzanuz.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/wutitasaxifopabulitoruwef.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/lexukigu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/61027186431.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/38257192179.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_off0000c55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 10848 bytes
SHA-256: 508f8464694d8cebff417b1c9e2466a6a3238f88dcecd1d2845c6264fdef79f6
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 20852 bytes
SHA-256: 5fe67b4833d6277bccb32a51b2cca8c052cd9b6641514a8b20b8f6e54cd02e50
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1