Malicious PDF — malware analysis report

Static analysis result for SHA-256 89604690dcde9e38…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 05:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40b2435dbd9590487e47bd75e1db088f SHA-1: 94460093fcb111a6532aded9fb5a1df507708199 SHA-256: 89604690dcde9e38cfb580dac2401cd8d7279e1e235fc2b7540201d457465224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and appears to be generated content rather than user-facing text, reinforcing the interpretation of a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/46b4ee524d73badfd2b2afb059fc36a7/43533044980.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ronirumugojenezafuxotik.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ede7cabc5---58609108432.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/58233404897.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac657e4dd9---28383186050.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9clc03rr8kodtak5bp69dfvsr1/xiwukimubenenol.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/81869466314.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/kd8qjuc8sla2l9nrvs0h17kkb8/10357587351.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/hlo5ml3t07h354ctev8s3h0mn3/jeset.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f349fd76f8dabdc8d8ca3051262f6825/29154479091.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1e21bf6c5e828330b27ac0ae89b58090/gexemowuge.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/mamoz.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/8942264238.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/28592881730.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/49285993169.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/77799003430.pdfIn PDF document text
    • https://baptistfriends.org/media/28185188701.pdfIn PDF document text
    • http://sartor.ru/upload/files/26366764952.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9d760d44103467ab674c2c00148285f0/tawugulodu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced46d7011---54823617821.pdfIn PDF document text
    • http://fittbike.hu/files/file/9103617430.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/desisopajabug.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/77291119131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=makkar+ielts+writing+task+2+pdf+2019+may+to+augustPDF 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_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 11688 bytes
SHA-256: 184c13a782b05a9c432bd740168150f15b446ed186d7ef47e12f169bb3e06f02
font_01_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 15892 bytes
SHA-256: 9557fb7d21e64927b2a16405e044ebdf2139b8af85c4085ef037e57efbc2d571
font_02_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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