Malicious PDF — malware analysis report

Static analysis result for SHA-256 359be37202120b0b…

MALICIOUS

PDF

102.7 KB Created: 2021-09-15 23:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a603d7c379ba1d3b239ff81ac47f098 SHA-1: 96aad995f55f7b9e48c1c2b28d79ea55fa171031 SHA-256: 359be37202120b0bf4518e9de760a46122fb999a66276931e45009dde2602be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://infrive.ru/uplcv?utm_term=strike+force+heroes+2+unblocked+games+77 PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9term21ohthpn8j5s71mt14mf0/bagenevijologivuropagale.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/32323104544.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/93680228812.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b042a2609---46461068195.pdfIn PDF document text
    • http://clingac.es/d/files/fidaxaxaxitokalewupejoro.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/vufamemalazolazirilap.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/51787109592.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bideperaxikag.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/pijamedizo.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/funugoladodiw.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/69f6e2e335da89d8df299fd3819920c6/32104767735.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/78181606504.pdfIn PDF document text
    • http://unibox.lv/files/text/godekiwaxob.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/gugomebagefoj.pdfIn PDF document text
    • http://effektfilm.de/files/file/22649186205.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/serojedikejekovakojika.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/dobamanav.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/biwukegixobolewedolezu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/dadonunefixijosulugonevez.pdfIn PDF document text
    • http://flirdining.com/uploads/files/kaxibite.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/49469074579.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/zogek.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/setonunatijosokelunekup.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_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 11500 bytes
SHA-256: 2e1f19175dd0ab165ad985da5b354005ab6c8baff23f403ae95bc90097dd6117
font_01_sfnt_off0001434b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 19308 bytes
SHA-256: c479906db63ab5c5892a0c7ca2719dbafe4dfcb7f97b3d0c5f1cb36709a36db9

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