Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf36ff45348315b…

MALICIOUS

PDF

88.4 KB Created: 2021-07-18 13:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d906816cce98757ec721c14ca956ceba SHA-1: 022b3e10f9469708361bcd363438eba77afc239c SHA-256: 2bf36ff45348315bde3ef591dc9844a508cdbbf7a80f5f7ccb6c699097755c1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hissekurban.com/resimler/files/sewilujolikar.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/detajizog.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wiguzaposog.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c2d38bea2e37bc9bd35727686c8f6b95/6014790325.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/guveved.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/82090200191.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda137bdcda---ximunepekezi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/zikegufubovuxerozumi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8a082966487ef80c6930dd629bc30857/ketexuxizafewaxel.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ed6b6ac---93202781360.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zibiz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197c9d0f8c---movizopuxonabuxidake.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5d0mlem03121lti90rbv224fo7/zutuxivogetijusakiroko.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/sv2pe8rhpr3ia4jpa444a1hvho/60096864561.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/lawakafodajebigu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/40342970344.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf82d8d5dd---namabitapes.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1f878a17c---42453646276.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b91838a09aa---60857367713.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9c7d51d598e6df1406d5b96a5cb968bf/lijokifodes.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f04ce19de---xekinetajaverag.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/vudeluwalapuxunekizajiben.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ea1379d2---66446066614.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/givudujodarunoranopode.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68340e5c22---lutinewiki.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fb8ijgfk9cl9m6dofhivv6pp0l/49548144680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=commodity+futures+tradingPDF 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_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 17328 bytes
SHA-256: d40db191f21b2678137ed49be07ab914e1d308e3a120fcdce8f364a5e060cd47
font_01_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B38 10896 bytes
SHA-256: b5335cbb985b8cd923c6dc45a0d9148dd23b1f5d79a57377b8728aff9d722477