Malicious PDF — malware analysis report

Static analysis result for SHA-256 635ad607d751245f…

MALICIOUS

PDF

87.4 KB Created: 2021-07-10 04:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a0bdc382118f5ec549a52b0ba8fa3ced SHA-1: 677be08c88fbc6dd990a37c7db0fef274b7c2a49 SHA-256: 635ad607d751245f55f2641b1d5367be09f991f98c26c1ee214f441978daf66d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document impersonates a cloud document lure, aiming to trick users into downloading and opening it. The document contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://businessvaluationapp.com//fck_files/file/8667885559.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/ligifixe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5fe6e45c---tiwewabuge.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/613aed53007cf8d03fcf0f2cb471583e/fakop.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/solukupixaxolebife.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608603875ec0a---66800016002.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68365289924.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1123e674ea94d435545810df5787c4bd/97217590782.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d1452806---17137103258.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5b1a98470cb385be10db0cb849b22ba0/mosawadufujapasizavin.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/89126721818.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7f0702731b58d027e22709ebdb8017ff/vubebatuvuwurenava.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe95963e7---51545141415.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160755d9607f33---65969890825.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/62932935354.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/13043672026.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107100858062352.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/suwiwuful.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/93658332166.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/gajime.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/lefewebiw.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/91859130541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=image+to+pdf+app+iphonePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/90192879040.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_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 10580 bytes
SHA-256: 50e7f53320d63c1247564ebae1d72ce16ca8b8d7ada2f737f5b2eb88ffc95b47
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 17068 bytes
SHA-256: 75b2e9d216f5dd13b4af119cb9e0ee08a125bd975a0cdb7c331e79607d9b6050

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