Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf657b41b7c679a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 09:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea688ba9f19dc9cdf7117209c74dbc11 SHA-1: 0aa8242748d7dab00e53d4f3d1800f7861946461 SHA-256: 6cf657b41b7c679a0968850d8644b21a167c6d6f7d25d807d7e1de3a4642ecd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an effort to obscure the ultimate destination. The presence of multiple PDF link farm heuristics reinforces the conclusion that the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/76200544309.pdf In PDF document text
    • https://raljob.com/userfiles/file/momezazig.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/demudurozub.pdfIn PDF document text
    • http://iviltra.lt/images/files/lovogefenetakabebin.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614b16abaacc6---19628815299.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca69250645---91780387959.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/62882557945.pdfIn PDF document text
    • http://armanetti.com/images/21405617791.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/o39stvj8lngsdhaagk4klg4bgs/60526515611.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092310365973499.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/jivobomosekeruseb.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nupanibun.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49a830a9f---21660126829.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/zedagotos.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/fosik.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xadif.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/54131029872.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/bezivusakutovimenofo.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/15078191455.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9814967b96231d9e033d78317981a98b/pujiralotaleramotizu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pideminarofafununona.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/lugirewodusopodogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=monte+carlo+123moviesPDF 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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 10796 bytes
SHA-256: 7d3a153714ea2a8dfb3b9d57c0cc7e891143b3552e606a10a10509f6cc6d913a
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 16340 bytes
SHA-256: 5f57f17a8be1bc546bcc10e62b631ce7006ee3884436c64c217e2097b7c37bb8
font_02_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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