Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1846eb98311042e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 08:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 091384ff96b3034d88f8e49278379077 SHA-1: e885abf2182266e27304b71e14ce58c37d7db340 SHA-256: b1846eb98311042ed8ea3642f8babb6b399a984cc2a1f3594fa46c1916b5dcca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.padanguparduotuve.lt/ckfinder/userfiles/files/41967701091.pdf In PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/20798953783.pdfIn PDF document text
    • https://bczenekar.hu/files/file/tigepigiki.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/wasetoladulixuza.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/73579269139.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/sipebekali.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/jatodapinezotuliremakojan.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zerafosonofimokaz.pdfIn PDF document text
    • https://breedlife.com/upload/files/neveguniwalane.pdfIn PDF document text
    • http://laduses.nl/image/file/6891783832.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161402d3286070---susuzobisimigup.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/13168149758.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/kevamirejubuzixu.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/62790269228.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xaxadawitewepubimis.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/47911906775.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/90550391236.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/80279795082.pdfIn PDF document text
    • http://cl-pub.com/files/files/62790361749.pdfIn PDF document text
    • https://panoramabyty.cz/content/gaxetarewixowinojagidol.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/lusapelozoje.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ribava.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/77aa0c812966ffcab4552357ab6b7f91/xejajitopiwa.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/kibajifuguj.pdfIn PDF document text
    • http://garderoba.sk/images/_file/nexasivenasovafolinor.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fedbfa93c879072e2e902c5af97c0ae3/58842491963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lucky+patcher+android+11PDF 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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 10712 bytes
SHA-256: 00fec2f07d96faa18c36e615ed0f5474d729ee80d21a026cedc72b0c3ba98086
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 20368 bytes
SHA-256: 637674607c686cee10c788fd84f5f7cefb6b95846f825f6282c3e787fee7399e
font_02_sfnt_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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