Malicious PDF — malware analysis report

Static analysis result for SHA-256 011e3f93ff6c42b8…

MALICIOUS

PDF

92.5 KB Created: 2021-07-28 10:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c097a94e83d1d71bfed072404e5c6458 SHA-1: 0a96ee8df3b8b948689ff3d63e0f16008bf31e82 SHA-256: 011e3f93ff6c42b8ec7ca64704168b689b866d074869d7593a9c7528a558f2c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/180ad125d15536fb34cdaa64862c159c/nazumekolejixakuniketivu.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/benuk.pdfIn PDF document text
    • http://policylic.com/uploads/files/40442616696.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/9298635193.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdcbc5eded2ce869bdfa93a9afb08/56619631318.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d3964974ed91e6f35bb1360f8b0090ae/20989904049.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2e8c3321cd6173572810c4a8e7723db4/koderajurare.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210627133459.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/89774492767.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1780a10613---bodegutenalibimuxufuboved.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6f0bef12b0f543e2297fe90721872f74/vamero.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668cfecfdd---wejine.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f93bcc0694d84f332e65936d63aec0fe/jezisuw.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ce2c4b1---nigawegexeburumalan.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kusidakejafopike.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe67k97i702f9eqhh2970p5vg2/diremadumuzax.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/revuluzedarezuta.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/11306666854.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/kefabalozetivab.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/sioc0vuihji37s3hhasmna6d1q/kasasumedofawo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/73315059960.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/3886206066.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pufolijurile.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/mijelizugesizupajanokokuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+netflix+in+skyworth+tvPDF 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_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 18404 bytes
SHA-256: cbaa655b57203eff1735d41dbc2cd26b6841f3f8d8e18ddf1728ce5641ccf89a
font_01_sfnt_off000132e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 10760 bytes
SHA-256: 5288485f3caab7942afde1ad6c5580408615bb76055127869744b906600e00a8
font_02_sfnt_off00014ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1