Malicious PDF — malware analysis report

Static analysis result for SHA-256 482809dab8b84fa9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 15:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac48226021c8165c2a5bc0f96360017f SHA-1: 6cedefd5b11e4c0488424c533a74cbfb3162d931 SHA-256: 482809dab8b84fa9c4c6e5f63839a2b790836bd3988460077f37c0571ca119d5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate it's designed to redirect users to potentially harmful content.

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://crysiq.ru/uplcv?utm_term=introduction+to+solid+state+devices+pdf PDF link annotation
    • https://gegeny.hu/uploads/file/85869992002.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780deb99b98---26440951922.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/webefes.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/10c7ea7c28df49482c1c143317e0b999/kazufagekuzo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a007ccad7d.pdfIn PDF document text
    • http://absigorta.com/E/file/84153919772.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f6245d43---wedevizukafusokowegop.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/gonudofotu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c8756065---50896971801.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/49916033380.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/rekupoxewoxek.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608058b3da8c0---zotosumusolamikusatu.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/boditeral.pdfIn PDF document text
    • https://afayl.com/userfiles/file/13575214568.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108220819521228.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda04834a24---79016840123.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b40d24bbfb---8087344047.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/36501018360.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/tosavibebuxeradalizal.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/peguduseninojopasilu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a1ddffe9---53670749452.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/saliwugujosebej.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/23926119205.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_off0000c374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 10732 bytes
SHA-256: 28d9dde6aa5ee758e7722ca19ed97f0f99f5780dfe50cdc3a71f74332d4ce75d
font_02_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 17072 bytes
SHA-256: d6f0c8ba06671bdf6f14fae7dd73a9608bce78f1922e59ec6961cf6b0f510820

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