Malicious PDF — malware analysis report

Static analysis result for SHA-256 49722b8c358f102c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 15:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 473362ffb0084d3e411ca2321cb87d2f SHA-1: a71dd8621d4d46726126cb05c6c555bf4da820b4 SHA-256: 49722b8c358f102caed84d6c456daa5ac406d87e60572e26586410beabb75b89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further payloads or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bgkemlhgc27bplpelaql74sl46/susijuno.pdf In PDF document text
    • https://gemwares.com/userfiles/file/mafujetifam.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd412343bf---bukukelukalotojolabed.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/gikolizekore.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160959cec15c13---sumorujom.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/6290b1459dad7f3dc158ba00407c6472/85355677850.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/merogazatilepipemabogiw.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/52610193645.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071043b3a914---gilib.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/mivenok.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/jejasujuvawezusatogejifik.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97565779390.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/bezizimariritu.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/27679849682.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/vagenosojis.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/289806df006a8abfa357f33540bddd81/37144833031.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/91550584110.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/436v4k6u0136pmucrjhb6pi8b9/43186514912.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/79340177059.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff26cc3503---nakototalijexobo.pdfIn PDF document text
    • http://caramelitos.sk/files/fatuv.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/59003506826.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119971b1ee89---10606498322.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062963112_300044643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=compressed+gas+association+pamphlets+c-6-1968+pdfPDF 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_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 17568 bytes
SHA-256: 2367a797c37af4beedaefae5423c95cf839fb035cffa38eb0f243f8c4eafe49c
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 11728 bytes
SHA-256: 4e24395b70fa87aea5469892a66f91e7281fe166bb3b916716e8ca2feb4ef62d