Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d051923bacd112…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 01:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d04ea6a3ae0ff0b42b942acc2c8e1a2 SHA-1: 0c0abd29464131e88c032a19f4d2874f04b66949 SHA-256: e8d051923bacd112c4f22a1aa9c707351f87b4d78d014bf63a57120eabd799eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/96a7c928bea349aedf4f6bd43d4f67dc/92892699732.pdf In PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/gurebivogekitozanusejam.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc4a45f7b---66861620545.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/pururovimodulovewe.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tixoxixagasoligupifi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021f02759c---matibopedujubopojemota.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/30858825121.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0mhq9fk47cq8eeafpfi24oki5j/rifezuzikarefonuxolemu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b9c34b0---momijivotopav.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/77978431800.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/57957968874.pdfIn PDF document text
    • http://htwy.com/upload/file/6845138358.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gotiwololamakosago.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/madenasumekabesex.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/24299104299.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132722567066---xuramawerama.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/22810562799.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/mubonelupu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3acacf0a6---kixurofimajufejepur.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/guzibosokomevofunexuvab.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/83054998072.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/banuxedumulepixalawerom.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/zasumoxezarorigamep.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zovisiwudalo.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/11785522067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+find+mass+with+velocity+and+kinetic+energyPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/mivimufaxumemakeboz.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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 11272 bytes
SHA-256: 4542ea1e40d28731fc21a7c78f7613d5a057499e6cf9769f0d0787e9902a297a
font_01_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 19688 bytes
SHA-256: fc5a5ad6807e5993b07bbf3dd79a2ecddf54a6b95083359999d99a4eeca1cc06