Malicious PDF — malware analysis report

Static analysis result for SHA-256 792c3c15a228ead3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 09:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ae57ab3cc68a4969f792edccb5db0a9 SHA-1: ccf18a90623d0f6bf07ace538258d239f3be082c SHA-256: 792c3c15a228ead31b9b2e0d2eeb59a6c5650e2be43d9e7061596422b364af7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aiswaryamatrimonials.com/fck_uploads/file/witekixulolepuxunofixaga.pdf In PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/levabatutumenifejuj.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/13528270266.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1792549fd9c21956ca3531c5e37735c6/vupoxelil.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/tefeputumuk.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/sujasiwisovalewek.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/24567835678.pdfIn PDF document text
    • http://www.520amis.com/upload/files/jujuwuduk.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kixamisixiwe.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/5084641589.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/16162079669.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/dezopexurokizadipa.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0ln5lcohukhj8a60858hhfsid5/694930557.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/765849505.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/xufadifibab.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v48b6r6756o0kh1jd7tsrmj6gb/misujemotulule.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824806f2df4---sizevibuwir.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/7778292151.pdfIn PDF document text
    • http://ore-processing.ru/d/files/xemiveta.pdfIn PDF document text
    • http://headrepublic.pl/images/files/jirifukexajusolininaki.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/midojisujufedu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/noxijiwiwipusu.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/vuxinet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=methemoglobinemia+adalah+pdfPDF 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 18420 bytes
SHA-256: ea701c656461c8dd40b3026ea8402924770ac549cc58d4334dc3eb6e3104243f
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10808 bytes
SHA-256: c30086bfd10c07b9d209990b4affb703ce01a3adcfdabb22fc2c5e03d2e0795f