Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cf8d00836d2f3b…

MALICIOUS

PDF

101.4 KB Created: 2021-09-03 03:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf6184706457b9c150e240595c33f1cf SHA-1: 90ebbbcabead254c81a331f53f34b5c5ab86d755 SHA-256: e7cf8d00836d2f3bc21a7bf7b40189a5b8bd36e03caa4af4a053d71a4171b367
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hv4o8nsi3lgrm9uiqd1rt2r5n0/57071910398.pdf In PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68242762694.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b6eb2684eebfdf2bbfac5f6310f75385/95093984333.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/eb21fb493e8ffdd5be91646ec032bab9/donuwiz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f54c03fc2a---1475095919.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080931d5d3f6---58367050383.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1fd43aa3---18367875908.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rvrgg8750qej3d2gh907ra6vt7/31781255066.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/23666591104.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/18763898609.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/jaxeninaridirulofaw.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/kelojemiwegubebexagi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/tikivepederewam.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e621097f7ec---55187739052.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/mevabav.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/mifopiboganisexatije.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/49815044064.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce45d8169b---poranob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=garuda+puranam+pdf+file+downloadPDF 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_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 22528 bytes
SHA-256: b51df2ef2ff2326a0b176a64ac60da4fc0d4b27c90f63221d9e235fb5545e667
font_01_sfnt_off00015792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15792 10620 bytes
SHA-256: c27922ccb7638411c8fc04dc04e89834f8418050916450ed2f8a12b7b7296817
font_02_sfnt_off00016fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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