Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b4b7d4ed328fcd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 06:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b92c4b778827dc7a6205ee71485f13aa SHA-1: 9e752780dcde74310293693a4d8251e59035a501 SHA-256: b1b4b7d4ed328fcd8551c0c42541cb8feb17a07a038aa1b32b79dfaf2684d612
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly suggest this PDF is a phishing trojan, likely intended to trick users into visiting dangerous sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://demo-calson.garment-pro.com/ckfinder/userfiles/files/79463061955.pdf In PDF document text
    • http://newcityhk.com/userfiles/wozokimosefezoza.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/61146532744.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wonavonogusom.pdfIn PDF document text
    • https://www.znackakvality.info/files/81326477455.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/vajonixarufit.pdfIn PDF document text
    • http://vipdiler.ru/files/file/53064332163.pdfIn PDF document text
    • http://deforma.it/userfiles/files/jixovidovakoziw.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/22413014438.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kamitedagilifumuvome.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16153c72d667ac---74210591519.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613021389b274---93010702681.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/tizibepumimofaragidide.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210909020430_720078205.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9200b7c961f47c05b12a521f692a2962/sixerebanidupukepowoxit.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/92547282011.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/60169535143.pdfIn PDF document text
    • https://aksusu.com/upload/files/89344752437.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vixex.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/65579954096.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/sifuxugoj.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/7007711045.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/46151168605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kanchana+4+release+datePDF 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_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 17464 bytes
SHA-256: 6d11c0b830872be110bdd3c7bdaecc458ca1ec74541b99031e569e0dd165793b
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 10324 bytes
SHA-256: d7a4eebbe1d18c2a313a4984913af318b80717ec564e05d7da3811b46ffc5568
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1