Malicious PDF — malware analysis report

Static analysis result for SHA-256 4250245451fd7d26…

MALICIOUS

PDF

93.2 KB Created: 2021-08-29 16:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05eb0766914e83c3970389e5b7fb28b5 SHA-1: d665f3e964b024e0d591ccaef7297a741b512a7b SHA-256: 4250245451fd7d26f117fb16931f1111775777d586804457b5b855653acff13c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/7a0227dffcbd594c4af1642b4188e109/zodajutakemigudezokini.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/14126595049.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/zonebuwudunemizafabit.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/15699542252.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4cbdd8735---zafobedakutogunekemo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jskq1dmc3t0414h4kro1235187/dotiponi.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/wikadetogurakusimapiguj.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vudaxunovamupida.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kokatizoz.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/moxegavewitiberoxalome.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/tujimazivapovetavuza.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/12151958766.pdfIn PDF document text
    • http://www.siposferenc.hu/html/8820757980.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/radevan.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1302a6eb39---24837412615.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/94648461437.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2a5486135---wokuba.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f7bbd2490d9ee5a91932dce9f60f58c3/89939426257.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/97468281389.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/xijexefepovebapibilirufut.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719838568ad---tofebatisegamemuw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5nsv0jad5mi6q67sns7ahv1rt5/dumerajubululudokugegebir.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/48839023995.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/piraw.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4140e712e---74879673473.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/75625717012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=velamentous+cord+insertion+birth+defectsPDF 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_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 19104 bytes
SHA-256: 18953ceca319146d6688c46f0b43527086767a02995bf8d2ff998e05aa5a39b9
font_02_sfnt_off00014da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA6 10948 bytes
SHA-256: 470c041cbec3a3d0e2cb2c94d374cd490b8151906de9cd593b03604c95b59c37

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