Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcfa1184182f62a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-14 12:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 729ee6924d864868f1f457a7b5843985 SHA-1: 7647ec6f766df26f72c9c91ea61cb1c272321fdc SHA-256: 8bcfa1184182f62ad63ead09687327b2074d42ccc635d76ad8dd6b0297eaf05b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm, with many URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting to obscure the true destination. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://clickbox.ro/images/file/xonaruwujutugo.pdf In PDF document text
    • https://regiefranchet.fr/userfiles/files/wedevokexofuk.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/pizaxirulelawinuvuwakumuv.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7820232b8---boxoximetilu.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/20036897829.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/93584904056.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/wusuwepuzuvipevigefen.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613509696667f---50823588713.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/wodosefakip.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/19092026360.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/gabudi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/wawetaxoti.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90804664981.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4aab2676---bugemudebatajibuxok.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/7940264497.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fabipigenalowifib.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/rigesajidadef.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/4047028764.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/47895778618.pdfIn PDF document text
    • http://gekon.net/userfiles/file/21120241827.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/67784796458.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/81741896589.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/guvivonobebosu.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_4BD656C069F827FB.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613763d2c9c78---94372086392.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bosimeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=50+shades+darker+free+downloadPDF 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_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 18212 bytes
SHA-256: 1e96bac7c68e2eb66ee9c355c8e5e8d46a59c08ea65d17666eae8989dc2b3861
font_01_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 10600 bytes
SHA-256: db309a6bffb5681513abe3884ad4012738546df92659588f8b00353725884758
font_02_sfnt_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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