Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f12dedc955b3b4d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 09:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d794d911934ac69c98e2e131278ed72 SHA-1: 792b4a12eb0fad1b145016d113a9f72f65a8945e SHA-256: 7f12dedc955b3b4de841d7c77174f2aa2a10731ef7279e943608fcf7982aa2eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous external URIs and is identified as a link farm, likely intended to direct users to compromised websites or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://catamma.ru/uplcv?utm_term=app+android+para+llamar+gratis+a+cualquier+celular PDF link annotation
    • http://hotelbelleepoque.bg/userfiles/file/golenofezazutode.pdfIn PDF document text
    • http://moretonassets.net/userfiles/91990538207.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70081618556.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c99bab8fb---78365729612.pdfIn PDF document text
    • http://ping-property.com/user_img/files/22243676092.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f9d8e50---gozasonofolokebun.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/24889887933.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/sipekafivivotuwet.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2goda8s13dbon5tarscjgfmk16/kuxegurelenegominidekorul.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/16917704478.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4deed19e6---15881532445.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/vanubatetakixaditefu.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/nugedok.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/kepubegijimaliduxob.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161392c499a1b2---vuwabaforiju.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6be2e220a---bujovusizogivonivu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/89336305832.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f42e104ad4296696e0933974ea7112fe/komabenupasazamu.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/puranovuxukopiboxowulavub.pdfIn PDF document text
    • http://fitviewer.de/files/file/fobenazosoparodivabog.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/tokefid.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/xesovaribekamemigu.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/61357745718.pdfIn PDF document text
    • https://upaspor.com/resimler/files/rukuporuxemipori.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/70ef4ae977b77c49cc78fe058a523698/22389866755.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezawi.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_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 19472 bytes
SHA-256: 4161b3b84d3a792fc21194d292b966705d5c3ef59d038d60091a6891d9440257
font_01_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 11084 bytes
SHA-256: 5896fef1bf98fa13b5c79d54c70f125bd768c9ead4eea7c587a48f3a9f5896a7
font_02_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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