Malicious PDF — malware analysis report

Static analysis result for SHA-256 8170b2b9a275d247…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 04:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab6c00fa249f5bcd273e05c65d3ba8ba SHA-1: e082aa2a0c1bd25f7810c462adb19b98b9147fc5 SHA-256: 8170b2b9a275d247ba89c48a6445d01e764638aa7fa8a422330961825cfb33d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e1b8d7f8f9af70c6c9a375cf32e527eb/16467469483.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6898cdc616---kixefixovekud.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16076d78035185---rofelarotupasevi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/52320956855.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b0178f7a---jototunobo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ed2878a---jididazumetiv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608752f26a23f---89898612875.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a57ba538---50868828367.pdfIn PDF document text
    • https://actorconseil.com/files/file/vujiwokilami.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/62255599761.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/38694014867.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/1520469648.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ff76b7183d5---tesokuwopifonanov.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/joladenipenelak.pdfIn PDF document text
    • http://leguido.net/files/52906640119.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef800889f0---xulilagekezeg.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/11557864742.pdfIn PDF document text
    • http://clarasonic.com/upload/file/98122037788.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb94fc99b3---64577805579.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/woribipazanajalozotonon.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/41283234465.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/75749052206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=factors+that+influence+soil+formation+pdfPDF 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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 10960 bytes
SHA-256: 1999f968530a5ec4bf8161fa0e81b35769b44024c20db3ae95ff45a1aeb3834f
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 17416 bytes
SHA-256: 3bafb46cb2c9a359c34c8333ba9f4b1b944af56f1fc0f4dfeae1cd611cf40bf0

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