Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a4b3c5fe93190…

MALICIOUS

PDF

80.9 KB Created: 2021-08-30 05:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1d29adc06fec12f6051c4c966c976178 SHA-1: bd8a91a767533cfcd71c9304842e87cb2b244207 SHA-256: 825a4b3c5fe93190c5f47744b0cf40a5eb9bc359619eeb5ee11917f897708085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content. No scripts were extracted, but the presence of multiple external links suggests a social engineering or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=red+blue+yellow+color+palette PDF link annotation
    • http://plafondchauffant.fr//img/user/file/jegudufazomanuruge.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/55351482950.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/33640284167.pdfIn PDF document text
    • http://rcmo.ru/upload/files/tozofadu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e3179ae0---18956966193.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb31c75e3c---wanuvavinisaberut.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb62be10ef---gegixoxonivexazedejugu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/65061541773.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/96992632589.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/39534694653.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/65848180226.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/koninurutuwojekeset.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/janusozole.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da2ea2b28---13209079109.pdfIn PDF document text
    • https://isleo.com/i_photos/file/30062047223.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/aa593cd5b7defbeb14e6d53e5d5d2067/86872990439.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/14bc0e9b85ecb272cbb69a0d2e6fd977/zezimada.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tutonujiwiganirogidibilig.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/witelifu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebffa05ec2---kiwojojodeza.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/66noml6m3ge7pq72vmlqckc8v2/tekarepisiginevewana.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/58b5e0176262a8cfcebb8bc45854854e/65076122904.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pekej.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/linosejizonefababo.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 17060 bytes
SHA-256: d7d353082cef79b1f6640fb91d418a5f5cd05cd3d1c373c98ad6e95af4c8636c
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10628 bytes
SHA-256: c242ace57a10ffe96105a727fb197df866e8e3232a6da80a8237e353d0d0248f

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