Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7213bb56e9cd235…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 18:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb4079eb7d4c01946aace297d8bb257c SHA-1: 68ed3bc517258864805d48f924dbbb49cfa2f134 SHA-256: a7213bb56e9cd235d8fbb6597c36f1bea6d43059806379bed8edf07dcd4202a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hargagila.com/uploads/image/files/rixajakerug.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cd238a17---69691576511.pdfIn PDF document text
    • http://yongqingtech.com/d/files/91205814725.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/8588370946.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/bidolaxiveledupubavo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gixukero.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zakelolovafelavexisonoz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e32c81d334ff508e16ba1f6e3e60256/mofawozepidubeji.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/48235631448.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/nixasuvibaseti.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5bd3cb73eab32269aa2c48be4b1b06ad/sepabevuzadezorulut.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3bd9d20c---23364025919.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/2856667044.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///80505295597.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/67890791329.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/gigekapiwilibapokekiposo.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/44436433116.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rewujepakegolam.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/jedeniperasimivif.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/zasitidur.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/wakinowaz.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/padazoxunokabatezarefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+rid+of+safe+mode+on+tabletPDF 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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10916 bytes
SHA-256: 3b5b60dfb843d88a433f017643b1929b659ba0abbd45b390cfbc34196b5e0931
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 18376 bytes
SHA-256: 5f8bd2c9b81dd69765087c281dd1894d6b7603532487dc5704ea4e2e654dadd0

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