Malicious PDF — malware analysis report

Static analysis result for SHA-256 63540d52a6b3cb32…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 20:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c37a771408e9a0dc0864708e5eefe1c1 SHA-1: 4db6264c63163d5f491b991b390b5836a70a8a49 SHA-256: 63540d52a6b3cb329acbf7ddc05eacaab8ae14983b685f350f5d6d39e8a2654d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting domains. The primary purpose appears to be directing users to external, malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cnp-inc.com/ckupload/files/xalipipokodobuxaxepap.pdf In PDF document text
    • http://imssp.by/data/images/fxeditor/file/49067813284.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9064scif13t3lsar269a7i5u6e/31775948950.pdfIn PDF document text
    • http://chamdure.com/DATA/files/65873281016.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109010720197119942jssgssu1p4t.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d1a64f45ae9925ef1f41506975d3d0d1/gizixedijusok.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/vuwexav.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a669f1a602---dobifuvikeraramoji.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/nelitodabido.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/98292860641.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/mifajawagezobujesipudusan.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081209feeed3---40627657537.pdfIn PDF document text
    • http://unibox.lv/files/text/31008471442.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/97cae55ab507a4026172fd8d4a822423/zukaje.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fc0dc47c---luvifodifufu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/garori.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/boxotazar.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/navadifigobabek.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a716e1ca0---gevexefasipurised.pdfIn PDF document text
    • https://strechybenesov.cz/content/13197570169.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/52407214541.pdfIn PDF document text
    • https://ocw.tw/uploads/files/57391311306.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/44627102777.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xunefazuni.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/95729763563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lp+perforasi+gaster+pdfPDF 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_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 19232 bytes
SHA-256: 1ec8fa801b2aedca732489a367a767773d22e5015adcefa936ef2cc6b5d42f7b
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 10480 bytes
SHA-256: 12c36161508afb411b03ac730876f55f04e91ea520dd62bbee80a97be06096b5

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