Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7915cefb1ac1431…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 12:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 736eb4191a370c1768f68e9262af35b0 SHA-1: a84b0c9a5a4fb7c9a62e5f342ad98be0fec51d69 SHA-256: f7915cefb1ac1431935ba2157876b7b08ec6b37a0bfba7549a0ed79b665ab5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=paid+private+instagram+viewer PDF link annotation
    • http://diegogenna.it/userfiles/files/30378860111.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/kobovamevulaguna.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7694bd27---bekun.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613548e2d9f1d---kadoxigawasiwomifiwab.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/14118197851.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zuxijixuvomenepoda.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/41955925711.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/94857228294.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fb35e3c7---demaxagojonoxugetubew.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/tazobaxufipexotesa.pdfIn PDF document text
    • http://sungder.com/upload/fadapolaxemapoje.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/mezadimupuruwavulisaguk.pdfIn PDF document text
    • https://o-dance.com/upload/files/nosazifanif.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfdca218b---70648140357.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/dinujexiwamomalixobufit.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/65123882302.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gufarutarasuka.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/21174840818.pdfIn PDF document text
    • https://datawire.gr/files/files/ludogepasevowoxoxede.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/nufikenepados.pdfIn PDF document text
    • http://thecuriosityshot.com/86146629166.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/11549557914.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/98552376724.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/49741159672.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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 18860 bytes
SHA-256: ff225011a4ac64b5efed2a606795877d16c8729fee1c9a6e987ffc024eca50e3
font_01_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 10724 bytes
SHA-256: d1b337d60944818064769cb03babf2e7036ca31a2515f011427c5da06eb6b97a
font_02_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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