Malicious PDF — malware analysis report

Static analysis result for SHA-256 248ad587c11dfd22…

MALICIOUS

PDF

73.9 KB Created: 2021-09-27 00:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 591332200b234730f7bcfcb1a32591c7 SHA-1: 8938ed145c62a8c43a9fc11b7465fde9fadcaa81 SHA-256: 248ad587c11dfd2223faeecf725af1cbc8d4d2a871eedd8198425d9d4a939c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://pixomot.ru/uplcv?utm_term=film+before+i+go+to+sleep PDF link annotation
    • http://asupuro.com/user_data/image/file/pupevobekobafefabogawu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/39743586730.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/97129743977.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/xejetavokozetuv.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b9dd6145---17857862357.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ribuxuzizisogevawalekub.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/timofakiwes.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rerozeboparufuf.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/lomuwenogosotipesowal.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/mixulaj.pdfIn PDF document text
    • http://iveducentar.com/uploads/assets/file/87756055953.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/80881068342.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/ginara.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/36274272070.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/6904473491.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/laxugudomipijagato.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/abd27394b9634d2b73302d1cf4e8d3dc/kilakizelofemojam.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/30811932252.pdfIn PDF document text
    • http://conkheror.com/ckfinder/userfiles/files/doriziwoledenufokemixi.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/39595347803.pdfIn PDF document text
    • https://wrd13.com/force/file/41492362308.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gulutogoforalew.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/futeguvajegobagi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142054cc5d6a---lofubuvatajo.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/jubatelozisidofosukotexa.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/limaziliwubenilotu.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/tiziwewaniwixadolomatigek.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_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 18696 bytes
SHA-256: 95f160fde416e14d11480b5ebaf204a9f7c3e14f3387a2cf2f15929c60206426
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10552 bytes
SHA-256: 6eef230bb7c98b6a52eed68639316d348920e90f8a946fbbcf32db51918b49f1
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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