Malicious PDF — malware analysis report

Static analysis result for SHA-256 6347ec42276a4eef…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 19:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a024e15f09c6e71b53a463f952ef37e SHA-1: 7ec40c9ebce66f3d09e9e01407518f6c76c21a20 SHA-256: 6347ec42276a4eef6c4af2c71fdde1428259032c7bad822a45271f9ac5a1a085
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 CMS upload directories, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests an attempt to distribute or host phishing or malware content.

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08d740cb1---duruluwukarodanedesuvimo.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614272b52827e---33106354308.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/21728627118.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/81880322503.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/3128506780.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/32478197242.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/mivojifilexunojokogolute.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/xavidazixume.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/rigapu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9dd4dc856b6fb3ddbf8f61653e064ae0/jelavosatinotorubugalegig.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/jediloripevisegatu.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kijuse.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tefozikukim.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/37906871239.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/65514968813.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/50424883842.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/nurekupamuzilose.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/11817045378.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/28228042037.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/23557393789.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/66597760027.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/dugubiziwunaz.pdfIn PDF document text
    • https://spacio.hk/attachment/file/kodefonizanam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=noobstar+avakin+modPDF link annotation
    • https://mediaget.com/userfiles/files/74090686094.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_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 10504 bytes
SHA-256: dfcea92739ad13bfcd208060cf3593df15b7f31983683125e95b145222e646ba
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 17112 bytes
SHA-256: e62350f2b5125b75cbc850101e4a0ce33b77037870a9fd92c66f4416d21e1f1e
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1