Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7018f2aaf5d8f6f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 18:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37887f131519c621062c8635e65c624b SHA-1: 086c84ee5d9246f2e10703fc95e801910c1c848e SHA-256: a7018f2aaf5d8f6f100e6ba8f810be21fac94b66bf508ed831a826fc970d8ff5
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=class+8+cbse+maths+book PDF link annotation
    • https://smsenerji.com/resimler/files/fezotov.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613932798a102---pavixazijorox.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/tivofonijati.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/46256042983.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52c28de5c---povonedujoxipotuvosuf.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/75010801289.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xajerodixu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zesogivaruda.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a62cb1fac---57932121792.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/46405704710.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/favojuwinupawuwipobutal.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/82025917061.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/96472343463.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/54788770985.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/mawokexixuxipolovafojitul.pdfIn PDF document text
    • http://thevale.us/userimages/wizobobatod.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5cfc0169---vowagejoganadukowevus.pdfIn PDF document text
    • http://someteme.com/archivos/_20210910094916.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/wafesigujukovujefowowi.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/27697350373.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3813481141.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902090407.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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10668 bytes
SHA-256: d1b1e21424127b92ccfd1289aa8c82dc04100712d5470b8865f9a36a360c2abc
font_02_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 18748 bytes
SHA-256: 48b6e5ebe9c03d10be326b8f27072c3ab181d0f86a26d54a19aa52851cf6e4ef