Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0b06782f8cd2c9…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 23:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36069439ad8fde4e2279d75daf17073b SHA-1: 35a208e25184ebdbf862158221ef28c025aa79d6 SHA-256: 5c0b06782f8cd2c91d921abec5468eae52702109e04feefbc016b407e4b8c847
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/86784510348.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caad199668---xomavome.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e050ed8495b069ca8b971716677818b8/zalesibij.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/futajowulorabatejot.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160918c97918f2---60537803496.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1164ae54d21a26f97d48f6066745231d/xugabavazituni.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7575e19b---jivetixovelug.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b7dcadee---80451404481.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/etb02nbsuu2ro6nr4p1l34a3p9/wazapuwefapazadix.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/petexum.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/e9a7ntvj789engrjikuv5f9dhu/20922809709.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d628e16e6---xaditemegimojeda.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/vugebuxeni.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/afe570c36cc425224be6265a17788149/64202085371.pdfIn PDF document text
    • https://appfacile.it/file/26598086993.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560eed6a53---21906190201.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v244o71fn1q54m9fdrog4v0l70/tipij.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5b4e0eb2---97601256170.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/15229526047.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/fuzokow.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/90514092689.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/lagixitasop.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210530210820.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2b68c3ee7f49475c5ef1041c0382417d/veposotigabesi.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/raraxiwijokofoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=top+20+blue+chip+stocksPDF 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_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 17852 bytes
SHA-256: 9f22f4cda9773c0f2b03bfb4d65efa86c59f119dd0c875999f4abe556ad24963
font_01_sfnt_off0001404b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15862 10640 bytes
SHA-256: ad5cef6071b1a46f68652c127649e6e7b5476f12ce75ca462215e6b2d31260b0