Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8286565457bbbd8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 250ffd42f4cb4475f566804ed497fdfd SHA-1: 247783447fbb80adb81d6caf205dbd603b3618f7 SHA-256: e8286565457bbbd8f581391de6f0caf30544c530135f3a98d6d6d97a675ef80e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pcetravel.com/files/file/41118983406.pdf In PDF document text
    • http://sghr.ca/upload/ckfinder/files/wixemegunosuwotodebuteno.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jawagemeke.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fuzijalo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/vabedovuvusetifajaba.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronevuruvanixojitemibaxug.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/36624732342.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/22554032871.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/22407607391.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/70001958867.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/50b15f7fae561df541f2099a21814709/sopizamewo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/balexife.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/88129646617.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/20412289859.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/861f9fe6810dcdc228b37f4d0b5e26f4/79916354263.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/95147548926.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/duzenekiloka.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312203063392.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/11815430063.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/13971161069.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c58522661---kunodevaxanorelejeduteb.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/64447255112.pdfIn PDF document text
    • https://tl-systems.hu/files/files/divaxedutupuzipazolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+watch+it%27s+a+wonderful+life+for+freePDF link annotation
    • 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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 17612 bytes
SHA-256: d0a63e5b98be25b33f0c570e90bb17e5b42c0949aef7b85981ecd745a39f5983
font_01_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 10784 bytes
SHA-256: 95cd46d4778de97b5570224b15374e0ab42734de2d8ea5936db5440af08f00a0