Malicious PDF — malware analysis report

Static analysis result for SHA-256 875ca2261bb85e2a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-30 15:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 51ed47a5ebf00156107f30c0654ac000 SHA-1: cdcede83cca66be14d82d91790ae77fce9dd1936 SHA-256: 875ca2261bb85e2aebe015053ee8470ec169b56ca057b6ff01dcb78e477e3fa0
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 links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fe0b9288fafbe14017ddd9b00f1cd3ec/kudup.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0d65b220df0ec2bc9a07365d40e52657/44872292250.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/88271539030.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9ddd1c51a9ebbf18be283f86018e7757/sonanarosidubarixobumaf.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xuxufel.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/43115388773.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/fazid.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/masaj.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710a7ac012---87699431237.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210710_105838.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/304ff1d21be3276c3e9352af82021fc6/79541990375.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b728d99b99---53216662331.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/12486249544.pdfIn PDF document text
    • https://tonitomov.com/picture/file/98383224297.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ijteatjaaou0l3grknfptmu6o1/wexuvamemowifad.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c7c9f380---19976314187.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/62602203914.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedef4cdb5---vurobi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/c2sg6bmn970la4qg6talf4s9e3/tenugulewidovunar.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9a50680f3e837837f7e186a4c777345d/lituwugovi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4c7c18378123ca45a8cd3abdd66b546a/89910265668.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d02d253a9f5aad73e7f8c1e3fa3f40dc/xenukutolagaz.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/85177693447.pdfIn PDF document text
    • http://artospace.com/pics/file/80473660732.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/85884315784.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcf57c4d8---92327586349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=castle+story+cheats+pcPDF 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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 10420 bytes
SHA-256: 6adb8509fdff9863306554a3da088888064e5f5bfba1ba5f6118bd5489135472
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 16824 bytes
SHA-256: 2361aabf06b53901ff7fbee9e61eef64a2b833d63adfd4a62fb2b8f586fb2c0c

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