Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d3562bfcc936bb…

MALICIOUS

PDF

77.2 KB Created: 2021-10-04 14:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5019e0e15bcdfcb706cdece59c6e6c6c SHA-1: a5c5a6cfb9e82ec2efc5a7c4b16f03b154d9ea41 SHA-256: 58d3562bfcc936bba9368fbb1481a88ab6f585ef108cd875708ec7988ee9f47b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. The heuristic 'SE_URGENCY_LURE' suggests the document may have contained deceptive text, but the primary function appears to be directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://accessibilite-salle-eau.com/ckfinder/userfiles/files/61328461695.pdf In PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/91443371312.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/menozevobusujifojapumi.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/12320968752.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/lexeve.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/41675621701.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/tawalodepukojebet.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/60517106689.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f16a16a3f---75833115450.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cc8eeb825b79e11471c2bd45968921df/81130956845.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pudivorujafolejezasufanin.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/lixiluzuwadoxutigekik.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/leputekokugezazadu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092005442746.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161571bbc7d4c4---31967390599.pdfIn PDF document text
    • http://fitviewer.de/files/file/44457332517.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/bobalod.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bimeguk.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/gonexukipukus.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/49384259645.pdfIn PDF document text
    • http://caythuocnam.org/images/files/25848934850.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/kelozifomimabuk.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/girenodovolumir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=10th+grade+trivia+questions+and+answersPDF 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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 17376 bytes
SHA-256: 9dd0b78c6298bb17f793f9ebc6c9f81c9480821a251eb1c75de761fa9525605e
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 10956 bytes
SHA-256: d3184745c49c2a47d9ef762ef226c136bd0334771fcba2fe8483eb80b511bfa8

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