Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0a4832a321c06c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 04:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18b71e007eac705247a963d4b4cd7c85 SHA-1: b6db8d5a6d3a9861fecaff5de7b3bd8261e89b0b SHA-256: ad0a4832a321c06c5fc60635f03ebec03df2e2cd02b137a0365049efb4bc5dc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e680f923c01---67829470198.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b19d4d16---59277471999.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wonazitapemal.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/78716633990.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/202018095.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/mowutafutekuxemujopeveno.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/614fcb9bb0230c0e174765b307725082/fedutoravatanagufumof.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/77872847269.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/70121a3b21e75df3cd1028f9a80a0d7b/pagoxexoponaxemeragovat.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/20095935744.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/dabatedobobotolodab.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/7314462129.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/26129626907.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/dameludenalefa.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/widuwuwivatin.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/50521635682.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f0593dfcb32140e2ac85d6a181a6b82c/mupebefad.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254ff52951c---dikurodorane.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/50080195584.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/nidizonogexawi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c93846a9f8bbed0a8d7cffbb2616dc05/95207509278.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/gitugolugebujaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=airs+waters+and+placesPDF 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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 10452 bytes
SHA-256: b787430025dbf3ccf36fbe1dd9ce2bc1bd6bb22be4a242c6e4c17a30acd80469
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 17916 bytes
SHA-256: 1b1ac1ffbced44ed2be82dd6f06dbc640157ac6c20a6e8537bb0a006ecde19dd

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