Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8ab4224a66afc2…

MALICIOUS

PDF

107.0 KB Created: 2021-08-03 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c64e7d8550186e51d9f0c08c3e3b8c6d SHA-1: d366cb7ba6391bcc76c51cb3c232a59f5fa7624e SHA-256: af8ab4224a66afc270f3f30f4252bac7aae79ffe4d36180283eb6df4406f063a
236 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits multiple high-severity heuristics indicating malicious intent, including a browser extension installation lure and detection as a phishing trojan by ClamAV. The document contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest the document is designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=what+are+the+characteristics+of+media+and+information+literate+individual+brainly PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc96199a9---46934206084.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829169cf56d---64164128460.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b262ccd53e7c3e976225adeb4decc45d/94024739855.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e86ce03e7---guwanefupusiba.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89f28d4b3---juzudakusetanavisif.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/68918159846.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/96098309518.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/nubejofugevijediwoziw.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vegibesifumu.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/039f0754e64e1ae2e0672d1c262ce8a6/pixobeburig.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c98c7ce44683f63d99e2d22ba44de2f9/xemuresuweto.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ca8fb877362fe2787d98b1c442a2e8eb/96362925959.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dujejavaseg.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/87405061523.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tegufakudof.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/nesoduxi.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/lakemakizurirodikigasen.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/64373239394.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/15810862821.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nodetonuzoluj.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b7403aa0---mufinasomasapov.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xufogejadiku.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/95qelf4s2tg5gn9s7vbc4t4dn4/pamemu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/u931d70dujr3g3m726ccp3ajs7/13269136145.pdfIn PDF document text
    • http://rnralpha.cz/res/file/46989978583.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_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 18172 bytes
SHA-256: 3e2d7e81079dc596babde77075f5827b6331bb77cc3c6f7ae2b5cc6f22d9f0f0
font_01_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18337 11152 bytes
SHA-256: 464456d1d98e6b00c4b636cf69022153a3793b1bcad513f65bfe8906499b34c1

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