Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b946e9c642f70d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 14:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c124ab3e407cfc59fc3abd4349c6a6fc SHA-1: 7fafa9dc0c27c99e7011fb9fe5ee320913cc3e00 SHA-256: c8b946e9c642f70defdd33954b4435924cfc5917f7864cdaad0b6f8be6f512f9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a common attack pattern for malicious PDFs.

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://hagepoorter.be/files/files/76314931748.pdf In PDF document text
    • https://cicadit.ro/UserFiles/file/zufowokifutinelogadum.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/l4mqq39ppvssghq09j415j7su3/liseladedategodokupelef.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/67dd4fc8af92bb0d3c019b0788c29bbc/71733852317.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/44175080462.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/jimadizogavekorejaj.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/752904c48813557412359ba462faad03/30151709216.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m3o7ddgntp5kfeq2r4ehtin8i1/85871077759.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/89665738445.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d609e9f7e5---58950428621.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/tavakunuwujawuloguguvew.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f8c3a9e9---74566129532.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/rekejokokebetiwiwutav.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210820233650_1368956497.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d187c8c3---99145708665.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/g4eakuhp5v2753dl3alnk0lt55/207345121.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/tumiletiledazola.pdfIn PDF document text
    • https://maturana.cl/upload/file/44308218891.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/88259706523.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/62423635828.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/kedevanasifujujokegotiw.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f4006af9e6c21c43e2dd1944ef773b5c/94761695368.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/98288524837.pdfIn PDF document text
    • http://htygroup.com/upload/files/zevilud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=1997+bayliner+ciera+2655+owners+manualPDF 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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 11328 bytes
SHA-256: 32ea9676a432e6c18d42d820445a0e6040d1b50b65b530a4b96fbd803353ca15
font_02_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 18000 bytes
SHA-256: 1b2bd7640a1f38b45f448f8793a25a15274ff854a1da716233d89bd64dcc9718

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