Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2be3b2a55e0453e…

MALICIOUS

PDF

87.9 KB Created: 2021-08-03 10:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d53bc0af465a78ea655395224939f603 SHA-1: b43220ac34a794ded5821bfb4a6036cacf45855f SHA-256: c2be3b2a55e0453e5170d6ce9cdb727524833b8bf4d750a07f3dd3aae0047bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=actividades+de+lectoescritura+en+preescolar+pdf PDF link annotation
    • https://bangprice.com/bangprice.com/beta/cms_image/file/12266934407.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060402292873499.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061906434468.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa6b4f948---35356680495.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/lagew.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f60244c4---fekovawalobigisakudazofob.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/6279779667.pdfIn PDF document text
    • https://emmaushuis.org/pages/80511851001.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mdao9v432scc2ieckicrkt36nf/20844084131.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/70635507571.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/24379684909.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/45608204860.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e03a78ac---70275307184.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/52adf0c7136e5b63d183e9f7e42c6629/gajawavaxurefije.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d121a13f84---mepuxuxetexotixosezafiv.pdfIn PDF document text
    • https://windsbs.biz/files/file/72923407825.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9578f0f1e7---jurozo.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/zawinuji.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/sukutolikigabokejetofe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa54ad0d67---86128516032.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b21f2fba0---33611218519.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f51fb91b9---kipuwinovomanuxosazagiw.pdfIn PDF document text
    • https://scalper.ir/data/files/file/dejami.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8fa9e4cbd---fusose.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3caac3f0---sukazeros.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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 17732 bytes
SHA-256: ba6917542f2185087c34424076f5d82657a5d0c2fca92305c603ad103503c70f
font_01_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 10760 bytes
SHA-256: 3bae731fb8f3370d2f5a454f542906846335a55a73372e3ea1146bd971305b5e
font_02_sfnt_off0001374a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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