Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e1b83bd771ebd0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 03:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fed439f6c2db25da22b1b8bb242cc5ea SHA-1: a48e1cfa055181ad905c637d271229e9862550db SHA-256: 30e1b83bd771ebd0caa88d047d8e0aa8cf0abcd0e742b85791dc9e7a82bc12e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47f08d9b5---10649713033.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf9e30332---mikesi.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/dogonuvuzamijetasulose.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/zopavetosibanafiwujul.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/75866807744.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/baberogafegatikowaxepuri.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802e90d84e---zovaxojebenejugewapo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/00bd18e9be8952a6c21caee82ebb8d4a/moxinerepedojudawego.pdfIn PDF document text
    • http://gyobel.itpublic/file/dedovalekumifan.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609062350a3a5---66627067560.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/fasurekekakasuwevaf.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/85896093487.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/vakudegabe.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/35764254814.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210807_48044B28BE98A27C.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/63953513112.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbcc1ca7f---85952381208.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/60245953216.pdfIn PDF document text
    • http://alptw.com/images/files/xadovipavarutemixin.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608754aabba96---pimemero.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/78246743513.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4b9960c59b4c9945605bd6cfee6c5738/doratigijaberunotesen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=acido+glutamico+neurotransmisor+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/tefuluroborivabilop.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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 11044 bytes
SHA-256: 55a5913b39f38e0cefbdf01450294d4116c68ee907daa25fe5992a873fc03263
font_02_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 18196 bytes
SHA-256: cff826c8a42337bf14cef415dcfef24bb5a78cf72172b2ada2e525007f4962ff

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