Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b5ebe018111012…

MALICIOUS

PDF

88.9 KB Created: 2021-07-03 10:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 028c074ec64a5645bb931dd95d971698 SHA-1: 22592f94210424323a2f4883ce3d1b38a5375ce1 SHA-256: 51b5ebe018111012291788b73c3cf51adb3cc9d65202e3a446d6ec4fe56b7650
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=sad+love+story+video+download PDF link annotation
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e8242480---64975170844.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/k6k52dfi7rpve8h9kai9pi68oo/wawakurizixibavupez.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7310ee53---4580120711.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/loliwopevekogan.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gixeduzepafezufese.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jipajus.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gi6upfh8d8usuer2bms83nivkm/menarav.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ae49a8113369ee6d016d5f9b17cc9ea0/56703070218.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29c52a8f---9902105748.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ea1d57c66---paxadefasato.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1021df47---bifuzolizid.pdfIn PDF document text
    • http://garderoba.sk/images/_file/nubewuzabuzulomuga.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920504491b5---57439740932.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49e4c70329---kejijukaxo.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mijodedifabetejenoda.pdfIn PDF document text
    • http://santeh.md/img/files/wapaseboli.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/pizugodigegaxozagujoseso.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/zilitorumeduzagesor.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/zeselubo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085836edf13b---wofaj.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wewunujosowajafelapaped.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b233e9004---manabidamofalujawanofirib.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vm2fu0816d1e9ttn6cnoo6e6j0/33214877376.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/33908030729.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f74c1080c97f5904b0188ec78aa28753/42937720384.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

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_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10584 bytes
SHA-256: d569ad2c293abe1563393696f5a6f92b23d58febd3d2734ddfe7122274f12816
font_01_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 17524 bytes
SHA-256: 9f9bef7945f94754614fc0b4446fa15bcfbfb316443c98d153066e77f4eccba8
font_02_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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