Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90c8ba640bd8b69…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 22:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 022b5a93d536ac6af6988c7ff58007fc SHA-1: b6ad21b7b993bc48bea30e3482a01ac3a3e5d0fb SHA-256: b90c8ba640bd8b6940b53ea04bba3a682726993c58da343d693e07abb0b5e3bd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations, such as http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50802fe51---fekozeguwo.pdf. This pattern suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50802fe51---fekozeguwo.pdf In PDF document text
    • http://dolphinkorea.com/files/files/mukedonifavexezererakut.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613857b1c8056---6260867233.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a124ijoevdvjanfdcnl0fm3vb5/kujakin.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zabinekemegokuwikasa.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/lovokerosebiribadojowum.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wevoxepaxiwe.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/farilivipigamevi.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/febutifedatabowewa.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/mororoxuvobexubulifov.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/resemiropemufegekux.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fagonurubiso.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/4647610408.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4605e7584---vajogujibedema.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/41772374036.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kixesizemubebasowodonerun.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_F263CD2402A4025C.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/lofunaw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/temiwemuk.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0d20c78d---90978023786.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/jigijuvijojudasa.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/kunetovodojewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+other+files+taking+up+spacePDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 17452 bytes
SHA-256: 8ba3c23ff03ffacd17051c484a26952ce5dc0e5c4bbb8d22a6bdb5ab78fe069d
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11072 bytes
SHA-256: 72f239734dd82b7c0006e38bd4479a86ac0266895b3c12f59e2a89529baf22cd

Open this report in the interactive analyzer, or submit your own file for analysis.