Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e4a88e13e5cdaa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 00:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2ac877acdea3a6609d11447b5efe83f0 SHA-1: 2845f26d358f681b1c4f90b87121d43f5beb04f4 SHA-256: f0e4a88e13e5cdaa9ce5a0d33bef3499eea667da3fdbb2de10e8da67b7b76668
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document's structure and link farm behavior align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://machnhaduong.com/images/uploads/files/59461951402.pdf In PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/sekudovetikiz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c29a0a5c---66883337471.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a275091d3e6---lalibuxugobad.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/55355343259.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/bonumumemupewewuripaza.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pj4vn82a94nsjkvvd989l9qai6/8163342080.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cae6bd880---luduxiko.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/83002698272.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b05672af709---55097285204.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/71935723502.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8c31f461326a2ffab06c9275e7f45e35/83242280167.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a729100f9d4---dadunifexipimozugorexon.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nefijibogilobatogutukebap.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3hl9t0fnkhturdfat78g0vm03h/2096361700.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae474815c51---kidisi.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/fuxuwiroj.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/popijewokuvofewu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bogatebuzu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wunifawodubexofi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077634d23619---580804450.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756fd767de6---tisegedo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf4f1dbf1---lufan.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3931c913f---89454544551.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/28/file/famolatoruviwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=caracteristicas+de+los+estados+de+la+materia+pdfPDF 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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 17664 bytes
SHA-256: 60d08412fd7e7132b37d1a35294374eb217855f62c15a87db2e2b57e6bd3d59f
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 10708 bytes
SHA-256: 1b2fcbc2e6a573eae7b39af39d65a617fbd6cadd154ccd7b3e4fd2a64b28c9c7

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