Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0605fca2fce539…

MALICIOUS

PDF

88.9 KB Created: 2021-09-14 15:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27ce042cc884fa31f01ce734c0e78875 SHA-1: 90995e790b06fe0b95ca3b803399278a67bfbc08 SHA-256: ee0605fca2fce53937aef45940dd0b21dcd29c4ee5fe610dc20bac38a3da50c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=movie+sites+to+watch
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0cc3c8b6e---gomeg.pdf
    • http://schubert-hh.de/image/file/93659800153.pdf
    • http://1000projects.ru/upload_picture/file/8623757479.pdf
    • http://kozszemle.hu/uploads/files/78648465895.pdf
    • http://pinxedien.net/upload/files/99143738424.pdf
    • http://thebankcardservices.com/uploads/files/15300511048.pdf
    • http://platcometals.com/images/file/kuguluzo.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613187d0407e0---nafipurokofugenit.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/65979609310.pdf
    • http://keemunblacktea.cn/uploads/file/040132431852.pdf
    • http://retco.ge/ckfinder/userfiles/files/jolubojatewi.pdf
    • http://mlsy.cz/images/file/files/99284450872.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/jogijibipatonutosatu.pdf
    • https://zohopinler.com/calisma2/files/uploads/jitezalikadagoju.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ca6cb309---bijopawotagoxabadetewed.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/xegefewifiza.pdf
    • https://12shio3.com/contents/files/tazet.pdf
    • https://equalland.com/uploads/File/pebisis.pdf
    • http://alhambra.kopanramen.com/uploads/files/93407600833.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138664c500db---modabufaxanimabizerazibiv.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/tixotagetudabi.pdf
    • http://shipagents.nl/uploadfiles/file/vigikubakumexizejo.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/32157695885.pdf
    • http://revize-elektro.info/UserFiles/File/sadasadizulireko.pdf
    • http://jinruily.com/UploadFile/file/20210910071427871.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16792 bytes
font_01_sfnt_off000111bc.bin
95b0b8ce6b289c599d0987a03b7af3393e30618acfc5ada6bfb1fd43ea8d4905
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 10220 bytes
font_02_sfnt_off000128f2.bin
5cf90f3f38d4440b261484a2c6c5df1ee647506827c9f91dec0971945ecce743
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 17520 bytes