Malicious PDF — malware analysis report

Static analysis result for SHA-256 425e96e588c8be3c…

MALICIOUS

PDF

104.9 KB Created: 2021-09-07 09:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8c403b439c0a9e1e8cdaf7a9e168efc SHA-1: f1f6c02c156d18c70d807d040479a0902acf6617 SHA-256: 425e96e588c8be3ceece48d9ee43202b720fa6b48bd8114f87ece5e77468793e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting it's designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://smidgel.ru/uplcv?utm_term=marketing+project+topics+for+mba+students+pdf PDF link annotation
    • http://wsm.hk/images/uploadfiles/file/66068311126.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/43744880872.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/pewomuwufusozor.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7df8de31e539179475a1541a5c7bf4bd/xisolenakagalumafowok.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6a0ea308---96976306379.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/96988813770.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31169903327.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/54640224791.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d50d81a5d20---lemem.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/3d76cd1ce9e6f3a02cf3f560abfd6adc/datal.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/302153024081.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/482c8fafd3ce7d2f8deb642d155835bf/80520370139.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gemimovoramesaworepali.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073526e45234---18303450986.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db32e0e61f---78693499736.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0afe9fd70---pumawipopimobujazetituje.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc18444a0fc3e679ab7713ca1a0fe91b/71603759272.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/84365733006.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160982f3da7708---7473650236.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0146f73db255680037f2429fb8a25e39/44496757942.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jonufokizorilogufitovosoz.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/40279324627.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/vumizi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1ea55350309e04eb6fc215804c19853b/39161202352.pdfIn PDF document text
    • http://rentaruedas.com/files/others/42341386201.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_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF3 11372 bytes
SHA-256: 31272c0548156c7ef8faa9bd752ba861948ec3eaa8121fdca38e49ccab68dbf2
font_02_sfnt_off00016549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16549 18404 bytes
SHA-256: 9cbb373b6c022e5f08822fb91aa55ad068a2409af5551d2271d0feac0924b769

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