Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dda39349e31824…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 12:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4afc11e54cbcbadb006063581bad7524 SHA-1: a4e5f69b40a65ae68ba92a49a7a830a14ad6c090 SHA-256: 72dda39349e31824a9bc292c7ecab8653e0af119742a0777e98bb0d75c4f88e6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kuhomania.ru/ckfinder/userfiles/files/miwalazimuzaxefobiz.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f05a55c2439---6276858196.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/vakugenuborovixunukokitak.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210715_EC702DEBEE0AC2E8.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jawimijutigirodijuka.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/8697192152.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dt04n12vjcf061fngm39if6jf2/2307002811.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/dajevuvatulutamirotu.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210702152350_ctfnf1.pdfIn PDF document text
    • http://ymmicro.com/files/files/tujagaduzifozi.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/narifapogi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607447f6c9ac9---zakukanelegomujakita.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2dc5a3ce---rozetuk.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd21d3840---66294986267.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/robaremajidipazi.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/93493834805.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e4a8f453---guradipuzosasideve.pdfIn PDF document text
    • http://allasclub.com/campannas/file/93003452572.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/51013415671.pdfIn PDF document text
    • http://kelvista.lt/images/files/sanozunubeloxitefibebo.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/86576029182.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/23448504575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+to+doc+converter+online+free+fast+without+emailPDF 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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 10996 bytes
SHA-256: 179d73752495d6e4fd99a7b7e90df3c375ec6a3473f3b5f9a96c162426409a30
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 17804 bytes
SHA-256: 79918b627bca9ade8ed44204d6847cfe08b3fc2f55ad865a0e5b1bb1a73307f4
font_02_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1