Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe457bc0795190…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 02:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1839e5a2318d193b225bbff3b954c10 SHA-1: 176af45df59b2f7b1f41792028023d0ed61e713b SHA-256: 1bbe457bc07951901ed2eab0c2c978fa72c99e8bb35cbd4404c76d677a178e4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=unlimited+dream+league+soccer+2019 PDF link annotation
    • http://doudou.tw/userfiles/files/lejegisur.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/bokolerowafukuseka.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/jupunedudifezedigozebim.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/15942229876.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sisesemug.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/16222171427.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/zorup.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/36703167547.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/mivinoz.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tisomotibivagaxewikosofir.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/nukobu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fd731521---vofedojuroleresuxigobos.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/23228588108.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d9aa68b1ca430507a261e9ad24c7b39a/koxaz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/707d829284300becc3c0b7f6e9aaa6a8/gupilijutunutifenozobus.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/3197804334.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/35283482586.pdfIn PDF document text
    • http://praguetransfer.com/files/file/zoraxowimujow.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/sowakaw.pdfIn PDF document text
    • https://cncunse.com/d/files/befuwow.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/punularasatamokazela.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/13/zimugapajaraf.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/suzukimiziwunisesajive.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/95420442287.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_off0000bcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAF 16508 bytes
SHA-256: df7d1d3d787adc27642db199b5bb312a3417f1ce4a681c631fca5a01c3659196
font_01_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 11280 bytes
SHA-256: 53aed4b50b9dfefe81c230d729eb223b667e20b53a1c846faf5602cbd75dd2d6
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1