Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7923ce75be23388…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 10:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7f6b05f54ef65b3e3fe79f40b2a8309 SHA-1: 3dddd4ad6800faf7f907db3e1ffd34aa3eae6a2e SHA-256: a7923ce75be233885cff8d5d093d2da80882079c7e79642ac41f3e6a36eff82c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://china-glass-mosaic.vegner.com/userfiles/files/20210903_102923.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/takozavidikuno.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/puzepalalisuvepexidixel.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/35783350367.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/24098282159.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/towevezevofajosuxebe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613254ab53bf1---67241590384.pdfIn PDF document text
    • http://termocity.by/pics/files/91673231760.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wiselafo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/80729477437.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/58975187978.pdfIn PDF document text
    • http://feminella.ro/upload/fck/lazenemukemomosiwubefitan.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/75881429101.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/84721051858.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/topikixezebow.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161387f0cec853---besorodulez.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/gawatuvaronexokapawujekis.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/cc3a63320d179d58e1166483e214d748/meganedakisesanuzuzelime.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/fukuwuzapexete.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/nunominafo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4ptooohf9ig8c15lngo7aehj6q/23584562295.pdfIn PDF document text
    • http://hzqzg.com/d/files/maligawox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=serial+number+windows+8.1+proPDF 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_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16960 bytes
SHA-256: b16c58c8a2502c78bede96ffe585b099d128472721df57fd890c5608cf722212
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 11184 bytes
SHA-256: 89a65a2a9499c1ec4bd5264d6a57c762171f5b6a573e21b3a7fb57ac981388ae
font_02_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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