Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83453b0e6c2eb98…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 03:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75d5d487ac3a990585e40425b7ee11f2 SHA-1: f88f3b592904b948235c09704a1543ef4c7e88ec SHA-256: b83453b0e6c2eb981474e711725b610a5043e972be54d54879a57c7b9e024d59
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hnttl9pim64o6o1n8ahsl51rg0/pezogutakemu.pdf In PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9ec51257---galikelixakedutib.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/boxikujimasake.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/77028336367.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/1dceca1bc432608c627a33b0fbbf3e50/42351993096.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b951ab0---3852145488.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc19f3b8b---xewizudurep.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7373aacce0c102119ff3418ba42bd34/dobitumifulusiputu.pdfIn PDF document text
    • http://tms-operation.com/upload/files/34158260470.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/zovexekiposivananew.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/58ac80d577875c6023c3c30e4ba60355/87044729322.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/81555704974.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/noroderenuxedet.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b97606427---vagopanasimipafujukam.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/15879222410.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8c4b1eed---ruwuwuvoninafibivutoma.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57287144934.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/wekibanozeguzogezi.pdfPDF link annotation
    • http://accomplishtheimpossible.com/userfiles_ati/file/12445146286.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/6b76599ddf052955210bde6b44b4a0e0/40681168732.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/83148dca4fdd0af9873b32b69f1cedfb/96027122855.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/92664759460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lysogenic+cycle+stepsPDF 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16616 bytes
SHA-256: a99d3eae2d7f5d056c7fb649e58e00694151eb08b33f3c6fb10544e2782a420a
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 10360 bytes
SHA-256: 9a9b8b79253678d47ec2a8eea1549bb69e198331608ba3d55e5a5f1038019920
font_02_sfnt_off00012d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1