Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e97cc0dfb39575…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 07:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e417572875fbefe19ecc22697560750 SHA-1: 122d563f7e90b7f43b847e0695d6797531f223e7 SHA-256: 87e97cc0dfb395756e0a93cd0a7be1628a86f026450f0a9abe52938e48f8ea9a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware delivery vehicle. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically flags links to compromised WordPress upload storage, suggesting a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fiberglasssupplydepot.com/userfiles/file/83379142192.pdf In PDF document text
    • https://rafaellopezehijo.com/upload/files/52890097570.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/19593799816.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/vuwudoxorunaxeke.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/6224417634.pdfIn PDF document text
    • http://sinostandards.net/upload/files/63673333632.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/56255279222.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/xesamuragopalutu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/gadobexuxewe.pdfIn PDF document text
    • https://duvanco.be/docs/files/kaliberodaxuwumubif.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wawiwiritikuligavujatafu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/299e369242c874abc45048f83690efc8/nadojotelavolod.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/kizuzezaxuvibaxin.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/39b1d9b614dd481520db53e01efc03de/41904340733.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vixijilomanixobugarijej.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/bulujowime.pdfIn PDF document text
    • https://birotex.rs/images/files/38416223652.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f75db780---salanow.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/gudaxubituxosusiga.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f06c8d37---60549606072.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/96784054006.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/fovun.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/fulejavuzegigixipiwebo.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/53380564367.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142244799a3a---55022181018.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zamejigikixubam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=agile+scrum+guide+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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10560 bytes
SHA-256: 29c2b25560b504ac05d4eac42a535c2ca9e085e6ad78a260ee39a7ad37904cfa
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 18204 bytes
SHA-256: 393088bf03ab5d8e74b58525bdbeadc7d53214db0e49e33e22636947195f2d7f

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