Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bcbb8bb3aef546…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 04:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1486e891e10710e908c795598b44e344 SHA-1: e54b83327b45e671143ab8b76fcf999359b44633 SHA-256: 37bcbb8bb3aef546e2149df80d04611f220da5e8502277a138405ea366be7464
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malware distribution campaigns. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=talking+tom+apk+mod+download PDF link annotation
    • https://mimpi1pusat.com/contents/files/zaripikutetofemuwi.pdfIn PDF document text
    • http://pjteam.hu/uploads/98604548510.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d4454c161---lenomavowixijasi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132b9b368---bipix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a698d61db2---mugeniv.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/giluzedu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/ramegekijopovures.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136103ec1eed---pakugebagigimon.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/48323840687.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/wolevo.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/65789965775.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e297bbd33---ligarorurupupegolofajopog.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/30114073743.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ef9a7904d8e194609eb36e340b0c21bf/pobajupi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613113eea23b9---sebal.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/72725039289.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/fabiposeteb.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89b01b420---zadevodude.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/safosemetogekodegem.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/94672045181.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/davij.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/61839963910.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/50088931583.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/deviwula.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/85108872040.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/vivekapefabofoligugasusew.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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 10476 bytes
SHA-256: ad24fe57dd76749edce7f5e280365f798ddcd30bdda6e3c035379a771f56bac1
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 20996 bytes
SHA-256: cb1a34ec21167283e1b8cbcd1828ac789dd742037a68f8be471f72912b0934a8

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