Malicious PDF — malware analysis report

Static analysis result for SHA-256 a807280be93aa27e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 10:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23369eb36857c82f5c962420ba9b30f4 SHA-1: 3d9c8f4d4b530df3c0426694c684b498f8f6de43 SHA-256: a807280be93aa27ecb2c3d3c3932f69027c11ea90d56a438c7f0719667be224e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdecbb762---negosujow.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b2b9a24e---24144974355.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aecb11f0b8---579558525.pdfIn PDF document text
    • http://mega.kz/media/upload/files/3921763421.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/jeboveveja.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/belimajejilopadagaxoz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6c29f2b---83380346226.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/tivamoxinojiwasoverid.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/12522634896.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/jexokuwuruv.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/jiritibisusefex.pdfIn PDF document text
    • http://belloverde.net/emailer/file/11625946249.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sebufujop.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/25999391439.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kumarefijubegixofepada.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pgepqbduht6t4gm2dlf5s8u3ar/zefalapivirajilipixotesa.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/80089026579.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/pozidumamojukenepivuwuwa.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/nidutosogowixadewiraginer.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/63535936941.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tetawuzepameziwexezigevel.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b567e6b3a---nosorodef.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/kuxanasa.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ruvidokikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cadence+cafeteira+manualPDF 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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 10480 bytes
SHA-256: 6781e57bdd6d97ed2cc9147f608bd877a8fc1ede23d7c367b75c02c9f5b8f15c
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 19232 bytes
SHA-256: 542af8a4a4b066d1e30329bdd2bac74c3862ecff135fbf93c7accb55353e5460

Open this report in the interactive analyzer, or submit your own file for analysis.