Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc8f91369b3ee2b…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 08:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cc66ac4d8f7f5e997db6ab4c4e0e20d SHA-1: 56866c29c01021947f703d6fb0247924317e741c SHA-256: 9cc8f91369b3ee2baf2b7cae313c7778c4eb5ef2ebc98aa1e166090e99f2b7cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://habitat3.eu/userfiles/files/foxexudifovadipanawa.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/31927020799.pdf
    • http://boxethai38.comupload/file/nukomuzawadajigox.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/zutabatu.pdf
    • http://marinapogon.pl/upload/file/legugu.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e4cb3c73638c4befe15626ade7e26ec6/pazuxuzejosomoxesoritaj.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c57bdc361c6---rigimipigepi.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a60e2101b---fojojosolebid.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c66915308fae5f9846ca3e57cb79ff2/suresetilapitusitalom.pdf
    • http://veterina-hrib.cz/user-uploads/files/kosadazetemed.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d218ee667---54575094723.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e53e4e2c---75262401737.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb40c1dc9---nimewal.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/d42gknsbfkstr5uccp32o57581/51367901793.pdf
    • http://provia-events.de/pics/fotos/1/file/33558713107.pdf
    • https://meganimal.pt/site/upload/file/91859063156.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/21ed5fef121d8c8fc8d771f7015e46af/fosuzujarubodusanafebof.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mupaxelivefa.pdf
    • http://fixafilm.se/userfiles/file/badupavafuno.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/893665def771af8407d538132a9e7686/poxutafivo.pdf
    • http://grandinspirations.com/clients/75274/File/dutufapelasoxuvojiboxur.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c2a377c1df5179501f00e5c040144d8e/gotuted.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=unsubscribe+from+all+spam+emails
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e534.bin
6d9c27d147c7abfbef923a9aa4203327e12942168749014e159e6762a9c3779f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 17560 bytes
font_01_sfnt_off000112b8.bin
ef6df73bbfd2919bc550f6162f11114c2d161ffbc2526c57fc9b2702bb3fa114
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10788 bytes
font_02_sfnt_off00012b49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 16792 bytes
font_03_sfnt_off0001435a.bin
ca50c1c8cfe87ea3fe5d08a162813903fa6ef3de74f63b33554e0fa67d51964f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 16140 bytes