Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c70530d2e37769c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 20:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3531da242ca6acb2114891c8484c7dd SHA-1: bbb5a6e2b6f38fe934704706df7c51bf2d3edd6f SHA-256: 2c70530d2e37769c04da4ecd7604ff7796a3f54849f241d5f79e545cd9a07032
196 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm, likely to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://veterinarioassociatopacinidallatorre.eu/userfiles/files/60903468236.pdf In PDF document text
    • https://lacgl.org/upload/editor/file/8364098849.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/figibumijadebin.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/80396803789.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/66762694069.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/rifuza.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/polurowo.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/jigusoniz.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/44337031843.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/silixu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4c9ccbef---mozimoxawitejavixokedibeb.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/2225268112.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/gelipovijejejemomefu.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/80651554501.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/34503102316.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bdd02f60b---newozaxefidusojunep.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d6289b73---kaxiwilix.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wilepisosufixud.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/rewojazovedinakojamunevom.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/nupowerifukipujosifonubop.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wonobuk.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/gezagokunabi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210914184843410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cracked+premium+vpn+apkPDF 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_off0000b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 10532 bytes
SHA-256: dc095d81f43449c3d82139ad00d518dda3001136b7c42843b310f28dd23c36f5
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 15324 bytes
SHA-256: ada23beffe3a47301cebb3999dd69ae954e67906abad7d3a7380da4e232d7f79
font_02_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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