Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a73d7275d71cd77…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 06:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4cab4613120bc1da8a57b44bf023ce1 SHA-1: 3ac8efb8efa6ce67f82cb39772070524a2ac5c63 SHA-256: 3a73d7275d71cd778905757273d4ba136b2be46c899ed929b397ec03ea10621d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=chromecast+in+mi+tv+4a+pro PDF link annotation
    • http://gzbaosui.com/uploadfile/files/demavirotox.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21947004677.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/69218919471.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bumizi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-17/20210917152112934386.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/10583306573.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/86813014387.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/84394867168.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kolen.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210910014236.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/io57fihsdtehrc1no6294m8j90/wogiludefemonexemamin.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/53610920009.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423890a82fe---86507846029.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1f749d49---20869266325.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/57757178167.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/40001281538.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/5005878650.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/datipomiduwadeg.pdfIn PDF document text
    • http://sayarbobinaj.com/file/90431209069.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/ketozegozowo.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/62477304919.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e363be44f---4119419757.pdfIn PDF document text
    • http://cga82.com/admin/File/zekosefuto.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54450175540.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/dixexeralolofubakuwuju.pdfIn PDF document text
    • http://kaies.cn/upfiles/210901112525574328cgzter.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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 10768 bytes
SHA-256: 5354069d2502906b2d30eed55f0aae186d0a8c603df3bab04ee4fbc3f6032b0a
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 21652 bytes
SHA-256: e20b672f7f1c7a8375a39ef17816f7f78d6b1dff4c14439c9040afe1d9c5f124
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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