Malicious PDF — malware analysis report

Static analysis result for SHA-256 b096286ef57fdcf7…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 10:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5876a0c2a449c126a563d7dedbc9a464 SHA-1: 63b5ce5cf2ab1025ea4e6fa896658850d5dfd186 SHA-256: b096286ef57fdcf7a70437dcd668020c59ac11cb1f1bc40c1f28be9a6b879b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. The primary purpose appears to be directing users to external, untrusted content.

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 http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/kj8dpjn4o5blq0pbbq2j091gt2/vewam.pdf In PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/metoteri.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fc6d7676---87931439329.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbc61d442---bowigetisolisaj.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608035388151c---zereramodifakezekaduwaka.pdfIn PDF document text
    • https://mszukam.pl/dat//file/5286879986.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/lefiludugujipubifetuvegi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ece1ac9a---bajerekuwafalivagi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/nenatokekepugugakudovo.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/40889147953.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071014173673499.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/49086106982.pdfIn PDF document text
    • http://ahchala.com/img/file/68220771102.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/16532843030.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/zoxekuzeb.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a70e2d89---36115924417.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/pixikeripezogavejilines.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061413261473499.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/ritaxowusetodiboj.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ac9abb6211e282e50ef4f449866ad22/gaguwezewaxerik.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/tejogeriletapudoparobo.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/goberobutezobubimoxog.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jiwekebu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/34044275764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mommy+and+me+gymnasticsPDF 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_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10672 bytes
SHA-256: 7ed32eaa2462636720ded510f2320cd15a8bc4285711facb0a3bf5c1bb610bb1
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 17112 bytes
SHA-256: 87199fa8d71e0a01ec9791da9f595eb69c639c113834cb069b07b5f854ec6768
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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