Malicious PDF — malware analysis report

Static analysis result for SHA-256 066bba895b4251ef…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 02:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bb6f773b0a15c2e300c59c366af215d7 SHA-1: b3d1e86a96d76daa88051d46474f390694ded6d1 SHA-256: 066bba895b4251ef27ab49c10e309f6b66af3f8bba95ad026c1a4935471410cb
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lead users to malicious destinations, likely for phishing or further malware delivery.

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 http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec54dc50d3---17820322033.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec0ccda1f---54201323686.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mmd5jp00g9vqb196emcg2gklmn/mimunased.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/bf21ec1de6e9016aef5ded7f063575bf/25828603862.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/bonolodeda.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0235b5c7---melukuri.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b8e868c3---puwebafujekakadoliba.pdfIn PDF document text
    • http://landpas.pl/upload/file/52041752352.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b920898f020---xazapevigixetegugekif.pdfIn PDF document text
    • https://ekransamara.ru/files/59569436265.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105300723165333.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/botopilonax.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/827a74da194b693d356433a94bd8bc52/wulafaniwurulufubarimisu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/bp5p06fogghlt2g03jcakbs4m9/32122666805.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d964db8de---lujipexesipavuneparosu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7d14b9a7---38369413522.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/69745465802.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a84ef19a5---jagupujuzexonuxe.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/berijenujafid.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/surirozoximonuriw.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160da567973c3c---9644322182.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/8avmh3rd6s2kv8ndplpl7a1efb/71458669748.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f20d23097e59c3f2c8226b5c31471fb2/16695293425.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vejuberebis.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a825c64---pizovuxozemomuna.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad075eea01e---fitog.pdfIn PDF document text
    • https://[FIREBASE_PROJECT_ID].firebaseio.com/In PDF document text
    • https://[FIREBASE_PROJECT_ID].appspot.com/printLogsIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+applications+tutorial+pdfPDF 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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10564 bytes
SHA-256: 83ac664ec2a7386a6155d1c2e5a9dfd010fad7ec741943030582ad470616015f
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 17660 bytes
SHA-256: 3cd3caab4454a5eb65628efdaa52a4f1ef7fb81eecc5dcdc10b9f46a2b8dceca
font_02_sfnt_off00013de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1