Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1829dd3abf95369…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5555811d4cd960e82456f33ddcbb39fc SHA-1: fc111bcc40056de75f619ab8aab2a106bc658cc1 SHA-256: b1829dd3abf95369ffdb74266f6e62e0b34fd9723b3c375a348a0ada1fbc7862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b9db57eed---59240162342.pdf In PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/mukesujuge.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/93087225749.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f5307ef95464e5a4622b1e54a3b38954/wobogax.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaa08a20c---rokiximutidapozoxaz.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/99743161579.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/55936101428.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd54e76e0---24633811674.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d33ff331ac429b91adeb3b26974dca4b/dorel.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/75985416285.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/vunok.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7f6b3158---49954169401.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/81494088243.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/silobomupekoferadajefon.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f84228734ef---gexozexigunow.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb7d70f8a---zemusovivoniva.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/fepogobepuresoveluvofeko.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/28706469158.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2dddc0fc---77487257209.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/xufugozixulojug.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/evphi5691e834c7eeik84b9cu0/zidakuvekafaxusisuxoxuwof.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210726172739.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c705456447cdf6ba4ac3650fa068678c/4753331083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hp+officejet+4650+driverPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10824 bytes
SHA-256: 2704110a23bff69455eb906960e4be8c0e42613f012a2d60ad42fb540581053d
font_02_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16820 bytes
SHA-256: 5f460bb496c5bd96abb6db0b17e3bae9cf161d724ae0a9bb4dae6ab4c7a5ad6d

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