Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1496e85816e8b3…

MALICIOUS

PDF

122.2 KB Created: 2021-08-05 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42b74e52fa8948b52833c11cc9af7b2a SHA-1: 3e8743d4bfe16f1457f053cb6007e1e344906c8a SHA-256: bc1496e85816e8b340887cd87eb6cb71117de6c23f055c82551414f3d42c949a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lideparts.com/userfiles/file/1624124978.pdf In PDF document text
    • https://genimmigration.com/viking1/uploads/files/24002200382.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/wefezilepeziz.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mal3jmfijng72hmoo1fr3re89t/16544906177.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/janan.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/29582520616.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3bba099f---80397920153.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/45712422054.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d793ac95250---44132351664.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/59991013733.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/zapakejegapasavudilivi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce198bee16---41775714013.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/sefap.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/89313579506.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081478ac7cf6---98265103167.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/47870816074.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/18892525017.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a2aa6ed7---rajaruzajewawuvup.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/jamem.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/vizitunevevez.pdfIn PDF document text
    • http://palami.by/images/file/zifimosamigosenegetaze.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/171eefc6ecef21a1419983425c3aee50/zobojagojixomovebudituf.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/85765063920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=army+apft+score+chart+walkPDF 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_off00017c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C64 17260 bytes
SHA-256: 801d0867de872908af07c05e0c8c397ff94b5154e5724943734ac8b2ed75fda0
font_01_sfnt_off0001a95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C171 10824 bytes
SHA-256: 574786ba9803b47947a6dc47e7b18c3e1668645e71e6e9b03273feaef18414d5

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