Malicious PDF — malware analysis report

Static analysis result for SHA-256 30255b98b1f3f500…

MALICIOUS

PDF

97.3 KB Created: 2021-06-28 16:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9f2d3602ee270e42418086d0736685d0 SHA-1: d592997de10de0689cd6e12d2977f3bb60d3808a SHA-256: 30255b98b1f3f500e1c6a1afe82a19657d4e884d901a8c7743640e06b4dd6fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://synerhu.ru/uplcv?utm_term=geometry+chapter+4+test+congruent+triangles+answers PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05040cb75---gesegorepuxiwevugotiniwav.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gulevogu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/naonta8tt7a7qs4qnsddqcs1u6/wumatike.pdfIn PDF document text
    • http://babamoleskine.com/files/file/11360636795.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774e15e5396---gadebu.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/romesadopubabomitapaso.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc80cd2b9---bitumojopurifafonox.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3ba02d8f355c15701935d3f79b6a0c1/dujadapu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/supowi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/dexewupereruni.pdfIn PDF document text
    • http://royalgroup.at/tmp/vavijizorapurazozowu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/lugemenuposufebulil.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4636aa233e193f9ccad0a8cdaf236ef8/61532112498.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/87639023806.pdfIn PDF document text
    • https://birotex.rs/images/files/18883950891.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73b817f8e---22359524850.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/m649chakcd6k0ka7b4d33i6gv3/70511197017.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/nubekoxolumurar.pdfIn PDF document text
    • https://lesura.net/userfiles/file/3578166219.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dudezoduf.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/64768398982.pdfIn PDF document text
    • https://digireg.com/upload/nofoferepezofudejubavaj.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6tdoqos9ctc01rba19trjn6ol7/laxikijo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/15f9122c2b8f11254924947e60ec12c4/36428012985.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 11236 bytes
SHA-256: 4bb09f492e503bebe6036db513d4a68c2d5eb016c9b1aedf6b5b2761dea2854d
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 17604 bytes
SHA-256: 4e263bfe1c713070f0f6757e7e9e4b4a61006c5bf3c8276efd8b80acfa166cb0
font_02_sfnt_off00014973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14973 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_03_sfnt_off00015f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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