Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c52a9ff23157af5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 09:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 740bdfeac766634720a4e029af21a4f9 SHA-1: df1399c4329ff817db9b7c22fceb7d87f86b2424 SHA-256: 3c52a9ff23157af5a1b9397aa1e0f27e4570bab9da590cdbb50a598d5319558f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The heuristic firings indicate a pattern of using disposable hosting and compromised CMS upload storage for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=imprisoned+with+the+pharaohs+pdf PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16126c218c8243---12475061343.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/16136645144.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/43333809952.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/vefowuwelibolugutut.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5iu911jk892ger8j0nmjfiu4l2/wulosiravoguneluzeduno.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/22680458214.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/jovenoziwawomeme.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609842e1386ea---gigezol.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060500191273499.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kaxokojomuxitinaje.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/xapufakukapaxo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc032b2e6a---zuturezamidigofi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fc1b5f77---ripeseguso.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210813_193142_1964.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770f50f3749---52391532560.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dra11a2v7faf5h3ql5p6037pp6/venosana.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/66495300645.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/nereluz.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/mapomebes.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/4316734943.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/38339337567.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d2fa4d90dfaec87460ae0542bb708266/26918968561.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/levovibexoboxo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080321371652.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/toritabupap.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/14381061122.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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 10752 bytes
SHA-256: 9748f14aa782c464bac7ce37c6912c9020dde2d8dd808fb79bf677fc4c1ff6ba
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 18872 bytes
SHA-256: ddd172be06d1acd4c267aedd5f0cbc75806e0e1734d0798647e6e333620ce389
font_02_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1