Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d7749b627bf595…

MALICIOUS

PDF

156.3 KB Created: 2021-07-26 01:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f738bc7b06b2979fcf65d5373d74460 SHA-1: 75532d53addb931144518c3bdf2b04aeddf4632c SHA-256: f1d7749b627bf595834567b6f93fbcdb4d908b0d6ebc03cfe9974dda25e6bfd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e21e7d2393a---67217233906.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1848ba6a---58585765230.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6c7fe08d2ba2c7bb29ac6798c84b5999/40018437689.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9d671a36---23255211896.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0344091b---nexomigomo.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vuwamixodomej.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/9edbce09833934e14f8b97dbe74c140f/6177360081.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rcd3i22gbj920ia4ablflfhnig/solilopisenuted.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/48195004337.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/92009782005.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad141cf13ac---texusujuwutetesuzoxeroga.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5ad628c7---lugavikafobotag.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/68864446522.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef6e408e0---44968143000.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c869425c0d3---kugubipotapa.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/xumuvurukamasigawapa.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bofpjg6ltgp2o32odusjq6g9l9/tedonigafolibuje.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ca327743a7dba1af6edb163d8a869007/89842816458.pdfIn PDF document text
    • http://prosquash.by/data/7048908957.pdfIn PDF document text
    • http://nature-revive.org/files/file/47183279546.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/kitusogarogufepujikafodob.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/wixobutowutetiz.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/n3oa1q38em9v0jj65l6giaaki6/85373734342.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/dajuxulidazekijisuvifud.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/29111668113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=why+can+temperature+be+a+limiting+factor+in+photosynthesisPDF 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_off0001f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2112C 21488 bytes
SHA-256: dbe22b8d58f80704c5cc2ef6d74c0f643413f512893cf36697a110bbc5df2acf
font_02_sfnt_off000248fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248FE 11272 bytes
SHA-256: dd45ff6a1a1c391c65ce281a0ca9b88a17db4fba407ecca13af4e2e3dc74d802

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