Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95a7cd1655f0999…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 11:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e2c4bb4fd50dec15864df95ea6500b28 SHA-1: fcbe3059876ddd7f28584f5c0044be76fff4d778 SHA-256: b95a7cd1655f0999ad2eae47c67c20e055f6f80d7b55572985a686534fe31202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.jdconstinc.com/ckfinder/userfiles/files/jewerinavavoraj.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7a7e5fc4---pidufodurelofozofubedis.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3fcdcab1---xumizobokovom.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d86146095---dazuxaluruzumadujewifo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce803dc38d---26414321603.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/5309179167.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/14838446806.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160978b9923481---xujagukapobaxixefexewo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fofugowal.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/86513717090.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/62cd79a11ed681988d376a22ed435562/siwitupozewefobaliga.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210801200805.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vukurimobep.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/65309150591.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/novax.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7a9e7423877f3089bcc8525a1e1d3908/41017226029.pdfIn PDF document text
    • http://bulmarconsult.com/files/namezemajijamewedix.pdfIn PDF document text
    • https://petek.biz/resimler/files/repaxagudalijifa.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xokawepeketidifezoroz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0a50c521---temetavuf.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4e5effb0db737037c8c456a5733c3e1d/39231265671.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/11245547568.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a923724df7c---790481526.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/46278085361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=contractions+worksheets+for+third+gradersPDF 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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 10920 bytes
SHA-256: eb3e483df42e8d5307cb62f8df0f8f3d120c354268c4340047b482e979ef9ebe
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 17840 bytes
SHA-256: b868f06ec56f792573bc99f511c8befdd2ab8874a367c90d663f8508efbc5af9
font_02_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1