Malicious PDF — malware analysis report

Static analysis result for SHA-256 05aa2676bec5f732…

MALICIOUS

PDF

99.3 KB Created: 2021-06-29 00:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dc307ea56750dd57bd70b921abf7d56b SHA-1: 7e5b8f9088d1ea66a90c4fbdc357af078a4590c2 SHA-256: 05aa2676bec5f73242e2b74f7f46f5e78ca4eb9b648d075e5d39a60aeb0c6fb1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://irlanc.ru/uplcv?utm_term=beguile+meaning+in+english PDF link annotation
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/26vp0cud0inspnh5eeub22ds2u/45917446949.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/11469806909.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d9a3bab70cb8b2f7492d86f9c8197d83/65149647709.pdfIn PDF document text
    • http://candientushinko.com/images/file/xovipudemojukizunapix.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/62447599398.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d39c20033dbf15ed675aaaff775e8974/76059590200.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/85086790112.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/lojowidelerunupux.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/56611767929.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/90s8vi16o5o9cle05huc743lr0/8575964306.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4388d4670d23f629386f39e07dae43c6/36321129182.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/72128864061.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wonasivolisufewaxumi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/mederi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd097326f---58151502104.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8e98250498c2defc09357d4432793b68/daduxexe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e609c390---84813549389.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609596ff2b044---27906601366.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/pobenarakonuwatakafu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcq4kmafp31u1pdf15r3kk96ks/jokuwilaloxori.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d27bd1fc6b---68747457445.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9qjflli48vs88dp4hu379hdqr7/97167629533.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ci8gkpgh60d1ih9dio6as7ahq7/32647623812.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lozonaloguzubukikunir.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/39058532203.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015d28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15D28 19092 bytes
SHA-256: 3bad081bcd4084df00089d68fb8844f4cdb1dae2b372667aeaa4d4ec484e8c90
font_00_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 4800 bytes
SHA-256: 43628c73b3e44f61cd38f31deb3ac597b88e24892e01a58fdd07841e82357068
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10388 bytes
SHA-256: 00dbdbfbef17b64075c5300c3cb9b0a11a1948f5d2bf12eb51a77b80e581d66b
font_03_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 27076 bytes
SHA-256: fccbca53dd3a6cb9b1993f5865c598311e777cf960af7124a540b18893bebe01

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