Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a247835dbaa24b6…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 02:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1827540e9636d825cceaf084babf5a6e SHA-1: f1991fa58e0a29ced0a1cbbe1033280c4aadab37 SHA-256: 4a247835dbaa24b6c06e3a4d35af8681b8f5f8bc484932b391f9eb5c39b1c5e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous embedded URLs, many of which are on unknown or potentially compromised domains, supports the phishing and malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://glovimex.com/uploads/ckfinder/files/66424444901.pdf In PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/likalewojuzulozedogev.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/62891669454.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db963fd6350---65917123002.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/jijekarobutagefika.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/lemasutexedusejulefen.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/32200066005.pdfIn PDF document text
    • http://vejwun.cz/images/gevedifulu.pdfIn PDF document text
    • http://www.polni.si/Images/files/wazofalupojisovad.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8b793c26---68089318877.pdfIn PDF document text
    • http://firegallery.ru/img/upload/funurezigili.pdfIn PDF document text
    • http://livestocktool.com/d/files/sixuluzozetafowu.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/supeduwojifogalurupugax.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/vumetumapijozirexo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c1b25e7f---vibotut.pdfIn PDF document text
    • http://schokobrunnen.com/idata/rejupuruzabazog.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd8c5dee2---furile.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af70b0f17f6---30681593174.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/a9irgenvf9fq3u8ctqo9mjapbk/62146874907.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a922c3788fe---visovado.pdfIn PDF document text
    • http://axwelindia.com/uploads/80578041072.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/lexole.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/kotujapogimude.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nopizefupi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/25169631586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+z+shin+budokai+game+for+android+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17668 bytes
SHA-256: 19caa5fd7f99ac7b57ffc0201ba23a5f22ee0970356ba7c3c1611bc468099ee1
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 11180 bytes
SHA-256: f4c62909c7a9776dbe3fba8d77d1ff2e5bc1b50c56a90adb1b0da596f0e7ce48