Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa30ae40a53459c4…

MALICIOUS

PDF

136.7 KB Created: 2021-06-29 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 791cb70ed7c28efb7a9cae704bf8bf0a SHA-1: b84dac096ca26cf18be29189bcca1a723f17e825 SHA-256: aa30ae40a53459c4bafba2a6f15d2c2102de92dbd0fc9cfd567099b3a9e51ad3
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 WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/08cdd7e04d9f937c739e840106442a6b/pupunazav.pdf In PDF document text
    • https://cristalensi.com/public/File/wejobadigemeriliw.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mumegavasadabejezu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b765ef27c11---sufosawumevugumeto.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6963dac4---vavelovujudonitixusajul.pdfIn PDF document text
    • https://strechybenesov.cz/content/tamegepazavowow.pdfIn PDF document text
    • https://tekartltd.com/upload/files/vikerudegiku.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607264fc84ece---7536508024.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/aebbea64ffb79ed92219774603b5d904/wifaratonusu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791afbcdaec---siwajiviwosemapogusox.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mubunifevininavepamojuk.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3954991823.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e2436000a6f57de0d4f309a8db2d8a32/95462257159.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4d44c740579a25b68d80be804e983606/jaraxudofozofamep.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ce654698---57889148154.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4fafcec824fb368e65b3523a27e618d6/22498585400.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfce776a8---mabitobupofetulogamimul.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/20358185083.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/rumifudevupawutigu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/432a0bf971ffab1caf4260d4d0929cd5/modis.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/mumaxowupisoso.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a44f054c---xidopox.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e800fe9dc9---52016397345.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8af569b98---75620589353.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d042ecf99---zuwikaxobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=biggest+hands+in+basketballPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952340da331---91300948529.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000197ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B004 10592 bytes
SHA-256: 98e40336bf0701d663395e2af55a692377161f4da60af228cae54920be517a02
font_02_sfnt_off0001c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7E6 18884 bytes
SHA-256: a8e70801398f594fae9286f6c954ae3d4fa07332f00f699804de65508fdc8bbc
font_03_sfnt_off0001e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3EC 18748 bytes
SHA-256: b32c49275566a35ae7740fe78bd52c5c3594ec5ae36e76f8ac93b2f708e9258f

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