Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeaca6ef4174112c…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 14:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc532f7fa424674883057c565f57c135 SHA-1: 275c483f7e5a708797d055fb4f78b8cfaf7a4a9c SHA-256: eeaca6ef4174112c38eeb56d0732e5dd19c7076e57a66595fa857e9dae56e130
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to link farms and a specific heuristic for password-protected archive lures suggests the document is designed to trick users into downloading password-protected archives. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads, further supporting the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=mario+run+mod+unlocked+apk PDF link annotation
    • http://srs-budapest.hu/uploads/files/22434052537.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/9411973928.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/kitijometodasogupozuxexof.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/xadozolefejuruxu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/povonoz.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/pizenuzidozivuzuwevimire.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/47512821375.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/fenadalemadavogaw.pdfIn PDF document text
    • http://olympusflights.com/files/files/28173078128.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96377647616.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/58233847391.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c97721727---22283595208.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/34050877483.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/46502506639.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/xuvubo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fobod.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-24-00-44-00-21.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/tetanusudisas.pdfIn PDF document text
    • http://thongthien.vn/upload/files/dadino.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/popixeg.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/12103798090.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sasekojodufurudo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/88ba3c4f4942bc1962f27ffe17d29b2a/90334978367.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d3129e03999d425d127d47a2feed706d/taxotukawarojixu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/032cd3pqghotel0gqpfqko3973/zikebunorebisebuxuza.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_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 10596 bytes
SHA-256: c25b686a9a04ce0cc82fa245e17c384ae0f785e3a21d9f326082883d6b7f09d4
font_01_sfnt_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 16892 bytes
SHA-256: a3a36aca6ff06e691858232ecf19bb67b7327a5ce1af0e73d748251e40107637
font_02_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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