Malicious PDF — malware analysis report

Static analysis result for SHA-256 25badbc0ba82f203…

MALICIOUS

PDF

88.0 KB Created: 2021-07-14 01:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04ffc4754633f33c35c79afe6572c73d SHA-1: 9685d1ce4f7f18cb2ec0be98ddb5acc926d1d53f SHA-256: 25badbc0ba82f2035a87cf111fccbb88234207b364ce4cad2a47a64db1e2e7d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The presence of external URI heuristics and the compromised CMS upload link farm suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://smidgel.ru/uplcv?utm_term=new+builds+in+ackworth PDF link annotation
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8gab8c35i6cceklje6baaakfp0/dumoxaguge.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1da5a4b6---33856718235.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/xosemofotananisaweno.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb596b386---zirukakezejarunamepu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n88kh1nd0a17b2aaoshkdqejs0/fopafefawapuf.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef600cf769---95128295549.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/diluxegabojos.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/suxajik.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/nagajejimuxosonujatagul.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/25227227295.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/60592234930.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/turowusu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d48c86db5---gagewom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee5b53cd5---51832763127.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/87454832e311615f0549b03efeb56a3f/17385436561.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/bitowejilasezobixugubipo.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04a50f45f58663899be912556f46500d/87166697814.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/wugisikifiwapogipanepi.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/fewisagikedumoroxaba.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/33825697409.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8458cde0---gamajilor.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7bdiklm4h8l5pto2gucnruugcg/12077515162.pdfIn PDF document text
    • 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 17008 bytes
SHA-256: 9d88560d25d969f6ffa6d508914a172185396a7e0ea41151a20eb9141e0d9168
font_01_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10860 bytes
SHA-256: b546c7740f090751b1bdbd9ec4d473841e3ade88cbaf0ee286b133d8892fe6c6
font_02_sfnt_off00013914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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