Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3204134d85b894b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 17:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: acd45fd4fe74d5e68279789c8e14b0e1 SHA-1: 2a9f2f4a7b9faece608012a8a39284889c2922f4 SHA-256: e3204134d85b894ba56bd8dc38062508b69668c1d5453f0cf6527bddccf47e34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic firings related to link farms and compromised uploads confirm the nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=hack+gunship+battle+total+warfare PDF link annotation
    • http://miyozenemeryville.com/uploads/files/84815623717.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/34322867759.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xibododi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/titimaxapapa.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/45932747934.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/71646257027.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468eb73dc63---xezilinig.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/wedifuromazosogurila.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c4323564b07aac3d65f34e1f6a7a74b1/lawidufoga.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/fulatebevewumas.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/ruzamesuzarix.pdfIn PDF document text
    • https://kildevangen.dk/files/rijizolopeji.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/konusulokode.pdfIn PDF document text
    • http://hnfond.cz/storage/file/ferirewonezapojofamavadiv.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/jubebivimupubijo.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/15264439561.pdfIn PDF document text
    • http://edallyshop.com/upload/files/19042062490.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/sudevuze.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/95103280779.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/gugevadizemevexi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/77259129191.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/14370364277.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/aec7ce014a837351c38f6aad7b448751/zuzobajimul.pdfIn PDF document text
    • http://elitacasa.it/images/file/48555338581.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/68297803150.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/lejepewuzalemerolovabebo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 17476 bytes
SHA-256: 02391f8f226086dec4e521bcb4db5a4631bb9091d98cbd2d7d3339f59d9a1630
font_01_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 11168 bytes
SHA-256: 8a91a7ae388bd22d41312eecf1e331e708827d51e1446f2217346ab368ae9d01
font_02_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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