Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3977cc317448ce…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 07:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f79806b30063e2eba92e6ac91467e6d4 SHA-1: c29a4e22ce5533f650cbed08c9265a6a84a811a8 SHA-256: fc3977cc317448ce08d38752bd265881d1d8c14da9efa1debfb495b8f7923fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=atomic+habits+pdf+free PDF link annotation
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909162248994996.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/zajibejan.pdfIn PDF document text
    • http://remobudostol.pl/pliki/15920257856.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f6248d7883125a22fdfe38015398c4b4/48432881508.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/jabuxojapijob.pdfIn PDF document text
    • https://rintrans.com/files/60224829297.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tifelaloxugolotenaw.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/79536393860.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/wowawijuzolagubokomupogij.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909021217842475.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/suxabo.pdfIn PDF document text
    • http://atrsara.ir/resource/files/76242076789.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/72662333137.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/89229743329.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9407bc385739d107b4d590a483956ea0/kagoguzire.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/35146233627.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/sulegipukerudofuvilufoxip.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/fepigikemevinakotij.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ccsoisbqm4ru8lsglrd4de7cd6/93704845049.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/42205375065.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/92851981172.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/bafibip.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902215118_gjjkp7.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/1687970412.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/45576073734.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_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17492 bytes
SHA-256: c0235368aa06f9a32a207cdc7a0f2099a44c33441fb581adb431d5b3ba9a8423
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 10856 bytes
SHA-256: 6f8c7520616745e7253f300c058c476e54f4c953f84cde520d3648ad383d436e

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