Malicious PDF — malware analysis report

Static analysis result for SHA-256 6815af5c5bee9795…

MALICIOUS

PDF

75.6 KB Created: 2021-08-25 09:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54e1e8810185a06217a690fbaecb0540 SHA-1: 0751d1e39aac43abaec92207598053025a13f0e1 SHA-256: 6815af5c5bee9795b7ab676b1761584697b1450a1b1b3b016f8506e03f9e6ff1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple external links and compromised hosting points towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/6sg8oa9msgg2obni76gh22mnmq/vawidulobelozapagenut.pdf
    • http://unsersohn.ch/images/file/32558678393.pdf
    • http://bettynblue.com/upload/fck_img/20210618/file/potadoxixokugod.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641d8950ec---rogajufusuraxop.pdf
    • http://yljx.cn/images/upload/File/rurolenijebunidamud.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/97138622068.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/69v2qpo5sg5fbrrd9qlorpdvs1/41938219318.pdf
    • https://amrapalispot.com/userfiles/file/noloweveg.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdf
    • http://accronline.com/userfiles/file/xuvizeb.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8e5e2439---dibadanoralavenewesekujib.pdf
    • https://ludifrance.fr/userfiles/file/zenateparigikujujowu.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e89c6d459fbc16486db996dd7451961e/lotefaziperowusemudama.pdf
    • http://sva-jeanroze.com/xmedia/file/20643035863.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/73527916162.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160793b43984da---44620981963.pdf
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/buvefolunetudijilexokel.pdf
    • https://canevastoilestjean.com/upload/editor/file/tuvogufowinuponabata.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6c191297e0514d460a6779950ed0723e/62057762295.pdf
    • http://www.tramag.pl/upload/file/78830727109.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/33070910762.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ee0777a33---laxigalufiwijozetikita.pdf
    • http://webinside.pl/userfiles/file/22512619502.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=a+journey+to+hell+heaven+and+back+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b1.bin
030db970001b1e605697cedb88d7abbb09ab86d21c3c99c08fde10f4b90912d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 11080 bytes
font_01_sfnt_off0000da44.bin
dd5759891c8f26d2d4b70f38c05ff8a8565843b06cb7aef038eab9b678ea21f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 17288 bytes
font_02_sfnt_off00010734.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes