Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ac3e0fc2569b11…

MALICIOUS

PDF

103.0 KB Created: 2021-07-23 07:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04666069eb3344090ae531dd87f42374 SHA-1: e057793287747308ee8558c53ed8fe6b69df43fa SHA-256: 30ac3e0fc2569b11f1eb486b3c842c46f7efb50331901f78c235770943afd1af
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3dc59c33---85318802265.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2uu82l6n87la6u8hb5iep3p35/befokezezupirivadimomip.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/73928468763.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd537db1f---pojumo.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/88535504200.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tib6og410hjj804v3gddu0a5t3/95152506281.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/lupixebixi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/054b556db3bf97767fb25dd05b337eea/22384272600.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/kusakagoligojadosonivi.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/13591043783.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/varusirorobane.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78aee10fcc---82545154576.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///wujufitife.pdfIn PDF document text
    • http://skomi.ru/img/files/file/luridu.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/nanezukilano.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/gefobefikerorad.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/21746233742.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ultg2h7grj6gpr9nsov3orpuif/nusuridivalisazifutaxufo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/92fc2d4911b27aba220b6454827eeb60/vixal.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d9b56566---pefitonogopabewefujo.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/80329491220.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b19909f7d515fc95be509d9a2bb5f62c/netojerilejozidox.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cl055ghf65ro4kl84boun0fa7f/1103580326.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/87de2eec7373553aa0aaba7c57738b94/nexasujodelunopigeb.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/somelazapujej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=purple+lilac+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 2084 bytes
SHA-256: 2400d651bbd64a448295c3904ad7e01121d67c5fec21aae308039d930000738a
font_01_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 17096 bytes
SHA-256: 9aa9bd2dfedc5e3dc4b66ae3af3745eee0ca140321acf5e2772472cae16755f4
font_02_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7D 10432 bytes
SHA-256: 6c6db9b25b17cb5e1e62c3e38ba2c7be05b12318da7e0b6afab7c50e9fdc4c45
font_04_sfnt_off00017503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17503 16804 bytes
SHA-256: 87c6bf7eff783994c624bdd4d5bcca35a5cda451942bb55f36afe440ae0099c7

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