Malicious PDF — malware analysis report

Static analysis result for SHA-256 97543cc242019d80…

MALICIOUS

PDF

94.6 KB Created: 2021-09-04 17:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d017d12eca18ca34dadb5db1cb51da73 SHA-1: 5754300148c52085f0b2f4b3e886111674b03552 SHA-256: 97543cc242019d8001b3638eedcfca23460c9be9b05ae55dc2c1f8dcbd4e4124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://premium-h.info/files/files/xenokofedavo.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f9c359ab---bopupiwufomogerilasuwe.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/tozanonepifigiluseguji.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/82999390149.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ln728trhiqreb1ij3vdfcsckq5/lowivurisewodedafesodo.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/zogedoviwubomenozopewiza.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a040722d3cbac59f5448dbe9363a349f/93319972619.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4dthmv4v41t6jaod6nq5j3vadl/45108629698.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/wirixawuf.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/29947853148.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077248f75d84---ribuwipawu.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/34770186971.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/20b11128ac4e07a10b943308ef41c069/35228810068.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a86ae4c36a62ab337a677eae7a75a9e4/vixavukujibesetibesu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609885eabe2c7---zulanoga.pdfIn PDF document text
    • https://noddy.nu/images/file/jevotigefudaj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e20a3288---50085502022.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/saxixetudakup.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a55e9ce14---sokufisubezapisife.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1ccc0319---fenib.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/xovibexa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076872a28de1---28049637803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2003+ford+escape+xls+manual+transmissionPDF 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_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 17952 bytes
SHA-256: ec1046120d6f90c5e527641cb05a6a1c3eb9560c7bc867d861847cee68fe793e
font_01_sfnt_off00013a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15225 11300 bytes
SHA-256: e88f91a24877467561346cbbfa10c2b163adc4fdae2110537cff12fa0e63ccba

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