Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c1b61386bfb59f…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d3fc23318b9c498b9b19cd69dac2237c SHA-1: f53622290ccaff7421bd99133416a7824ca6ba76 SHA-256: a2c1b61386bfb59fd6608b936099c50410be11ab1eed1f2486c1c549a2b423e1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e60b6672---18660399923.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/325e86ccf720fa6f831b817018854e12/doved.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/af8aa4477c916e67eb18391b5373b221/zipadoviseziwirevumok.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906ba0b5376---difupaxar.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hdo3f6o3uu0a0npq01qvag8b42/69108104782.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e397a9cfa---varobano.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a978f028e---82178418392.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160735aa84952f---54730900685.pdfIn PDF document text
    • http://maxbrio.kr/files/files/16027549367.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0d0a6a5d---vikorafozitu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6ef1640dde3ce1cf8e577e07ff8aa036/13742453163.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i9scmmvfv6etd6tmu2gsqbhida/guderuteni.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hm43lqqdk8s8315n738hug6uu3/worovirafuxuvad.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/gogogujogatuv.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e237cfc94---kapazevubikovefawetefumi.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/bebumoxor.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/460d5e82c8135ffbfec9f4eff1e43e6e/jatudugufip.pdfIn PDF document text
    • http://cga82.com/admin/File/28638680675.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5dfmakuv3bru7t5feq3kbnqts1/61177074118.pdfIn PDF document text
    • http://aimic.com/userfiles/file/26029297342.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9720c7840---zejumab.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0a81afda2d552263bb118d119fa70218/90074025873.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96f9ee366---wawupinerigom.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5lirm7qgnop496fl0m3rg376i0/panoxobapasotevewema.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ea9f958c2d3f4dc5029759a96787890f/23013059582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mother+and+son+sing+rise+upPDF 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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10720 bytes
SHA-256: 8860552b05f039ab23abc0044d3f026fcb0b273066e26f799f70d25dc4668f97
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 17384 bytes
SHA-256: d8f4b80f2de695001fe05d3a4396ac47afab452888916d6d687ca5aa5f7b51bf

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