Malicious PDF — malware analysis report

Static analysis result for SHA-256 72af78c9177fc35a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 19:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 329f39ea1fbaa4b4eeac1fa7b10f2a33 SHA-1: ee8a31f7a4ccd172f4468ba8f47e561227eabb5e SHA-256: 72af78c9177fc35ae5cf4eabbbc52c3727cf5ad00aff601da55ac61b54ef9d17
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mvsexpo.ru/admin/ckfinder/userfiles/files/94851453032.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/rilunuporaf.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gafubamamoputurumi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140309063567---zapipenobezigoju.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dalirome.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/27623173121.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/84817541121.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vesutugukerewujuxovu.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/36192353580.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/woxikolabexewimuwewe.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vimelunenol.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/51463756916.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/29550956261.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/92606538908.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/notavus.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/fipuxiwuzopapegome.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd419d7245---rugigonegigizuvisig.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dakaliwutajawe.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/zolatofuxa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lb4lh93g3jj43m8pas59uve366/96622024567.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jijor.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/57852265546.pdfIn PDF document text
    • https://kermanrooz.com/img/files/93060156823.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/4413445491.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/mejipinubewipabofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=beamng+drive+download+mobile+apkPDF 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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 17908 bytes
SHA-256: 96f832fbe2b07fdfc83208ed63248b09f88c3fdb3eb713223bca4b881c8f85f1
font_01_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 10908 bytes
SHA-256: 94585e86c1d4e34ce779ab4ae21737f3c7ee3e4a4ff1f100abf8408f0b247eb5
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1