Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b00177af797690…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 09:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 158d4a4058c7cc7bee3c9b7c72d209a4 SHA-1: 57d4c6e15f6ca0e03de5ec0deee2ab42937a08d1 SHA-256: 80b00177af7976901107e9dcb9f645dbe8886672aacaefb0a8d79f21e798cfca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. While no scripts were directly extracted, the nature of the links suggests the PDF is designed to redirect users to potentially malicious sites, possibly for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ijtm.in/userfiles/file/29358687720.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609a176c27c9e---xuxunenosupeguluw.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/31748078253.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/dukufabetoluv.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/gozonuzavo.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/rulepekexulopewijusolut.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/48111213138.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/litidazoj.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zarizatemuxoguzepafu.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nolotuborotowepeg.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9f9bd94100832163d3e48141eb54e417/dugemoguxakilogotewopujup.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942facbb858---95888216331.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/nebemumaxixazagebun.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b7b263866---41695398728.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4884b54ed897252c2215c65f3982cb65/49289496378.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/69124084277.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/66835314266.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0619668a9c83e8a60d3a6702f66c9cb2/xomoxuzoku.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baae0e53ece---4671581793.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/rirurixowirotul.pdfIn PDF document text
    • http://royalgroup.at/tmp/17897265996.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/27159441202.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/fesuf.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/t72v7mb2q6oiai2n23i1306af3bfv7pb/29626376533.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/47293899522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=photosynthesis+and+cellular+respiration+amoeba+sisters+worksheet+answersPDF 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_off0000bc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC90 11312 bytes
SHA-256: bc963cb6d206f68008400453ad1fe347541212f1641d8f8406c641602c8506d5
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16780 bytes
SHA-256: 46a5e15f9449f4e1552981bd8740d2ad7ff348b3151e5a5376e8bf99581007e7

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