Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f45090c3f2e6e8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 08:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fbcf6f1970175dc817f9457683fadd78 SHA-1: f6ca6a6d9277ec3d149d814cf3a2248f385c0740 SHA-256: 24f45090c3f2e6e8f1a1e85946df2a6aae6cd04185992ce47c081090b8f73dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=aladdin+game+for+android PDF link annotation
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/tewulujobilavisib.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacc2862a9---63785965669.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/dururolekobotawoxid.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/kemudupuraj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82808883128.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/65782295425.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/85b567e7395cfb20a08e6e22d03df7e2/41726320289.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f34ea7728---radezeduxisilejanijuk.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/44226651834.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cc20a991---96884388991.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/gisesakuximakoka.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/77397091957.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210924065932.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/webot.pdfIn PDF document text
    • http://rapet.hu/files/23158691500.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/zokovelabujisewozep.pdfIn PDF document text
    • https://12tiga.com/contents/files/57798514759.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/22747023183.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/pozunanagotabowokimaxu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/bepabo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b666d724d6---64135553661.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/ruwakinovevapugiki.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/gijevizonabek.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/92702591314.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_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 17932 bytes
SHA-256: c1d763970a0b01545dae8266a04459cd13c46bb777aa461c8ca32fbe2f69ec2b
font_01_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10412 bytes
SHA-256: ef58edda4856623bf94b52165d947e30f4f117a79d2d5bc369af312c5e17c243

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