Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6eabe9928605ae…

MALICIOUS

PDF

87.1 KB Created: 2021-09-23 06:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5ed131e1f1baed4864cda9e0a3c4bb9 SHA-1: d1a561fc86bff029ed8b83927aa0cfa4e7d8f472 SHA-256: db6eabe9928605ae3fbd3f07c82b939102f711421fbd07e8be69b010ea7aacab
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=voice+mode+for+android PDF link annotation
    • http://happyhanool.com/ckupload/files/pironanalujasefi.pdfIn PDF document text
    • https://bak.vn/upload/files/zosogu.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/baluxudenuxusokepoki.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/65586257000.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xakujenavu.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/82324159864.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f85f7ecfca081a046c3068277781068d/81327711599.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/96371970180.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bonowarutivalasaxediwiv.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69051892222.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/gobiwetogifijosidizelo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5eef092a---68377430600.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4540743571fd7a84f41b5e4c9fc122dd/bodomanelezaloxezuji.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210916_004934.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/mazodomasoburemulalofej.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/9498080398.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/ratewagozaruwav.pdfIn PDF document text
    • https://kimansion.com/uploads/file/11681147298.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/pukanowu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/8274121632.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb69cc90c3---48454103411.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/migapisakaj.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/68083171178.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wofukus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 20208 bytes
SHA-256: f7cca83e43db95512b28dcf645169aa53bf0443c4644e4e811aafa39a6643b43
font_01_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 10292 bytes
SHA-256: a4d17db178e4baab12eff9592b8250e3463ab8a708fc8e0dceb6fb261ea8f3c0
font_02_sfnt_off00013732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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