Malicious PDF — malware analysis report

Static analysis result for SHA-256 e340c8a084d91adf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 00:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aba65ab76b32ce079151ee542bbf675 SHA-1: a489f7e84a95263eed91b795e73fb0db53a05048 SHA-256: e340c8a084d91adf7732719133067c92263ec9731ee0b0034d2f42c382fda1b9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. Multiple heuristics indicate the presence of external URIs and links pointing to potentially compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.evisiontiendaonline.com/ckfinder/userfiles/files/vobibugelelotak.pdf In PDF document text
    • http://hzxgdz.com/images/upload/File/bizefukivaparilam.pdfIn PDF document text
    • http://apothepharma.com/upload/files/romuvepusafu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613073b93bd09---kutine.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/kuvigasixatu.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/8759144951.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/51783918cdf68bb5c0438ef261dd63d1/wovebakituluzux.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34800955775.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zadipemezevunageziwusu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebfe0a729---venojigeguf.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bozatajapakitesazofixo.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/sujaton.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/49813359554.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zofesixuvexuvexovezapugi.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/18144949917.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wutesujiduzolevelimir.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/xakizakenixarimirapelamor.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/55b7ecfd83f3a264768d797ab539b68a/paxawafon.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210924225852.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efdb97b1a---73552648378.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/luraxukezanukovujukigo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/44109660973.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ecf2068c---rerenamasomigaparu.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/sutiwudumedimaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rootare+android+senza+pcPDF 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_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 16716 bytes
SHA-256: 77570b9a2ad8f9e15bab386c1ee5c9cdf77bf0957226f41d58c1a8672334610e
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 10564 bytes
SHA-256: 8a9565fe0f9fa10742e4cdbd71a45f9e00a7361b1b39277901a93553c5723d6a

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