Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5fcce02f1f50c2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-23 11:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d60d84ad3fcfeedf0958980a173b0f6 SHA-1: 81f457e65248309032159051c019d45ce408cbfc SHA-256: ea5fcce02f1f50c2fb844fc0562faf8e5c5af3f5193191bc36082a50b7b57534
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=coin+master+hack+without+verification+code+2020 PDF link annotation
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/75837027605.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/16459746235.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/66136728081.pdfIn PDF document text
    • https://magatek.com/documents/file/87583108432.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/45152592109.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/66277630881.pdfIn PDF document text
    • http://dgjst.com/upfile/file/wanade.pdfIn PDF document text
    • http://195exim.com/datas/files/regumavesewutu.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/xetitexirasawulolurigale.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/51260824555.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/piluratetegunaduleze.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/76830941378.pdfIn PDF document text
    • https://hoavily.com/uploads/files/68435470289.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/sitovajiwitoxinuvar.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f373b35cf0---xunaratepa.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/wekama.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nalemerinozuxowixugixokaj.pdfIn PDF document text
    • http://risme.vn/files/vebewetimadulibuv.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jegat.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/62ce903188e6d60a5467ebeb864e8ba7/78157146625.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/67089335962.pdfIn PDF document text
    • http://recviem.ru/img/upload/7574080366.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/bewojuguli.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b6s2ap8tvc30j1ddulq76mfo2s/sagopurelobivoluxefog.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_off0000bd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 11312 bytes
SHA-256: b1672c9bd5829d03ff273554655b038cb211869580db806debdcb0d2a878b988
font_02_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16848 bytes
SHA-256: 65e85754fdde44988763bdc9238f31109a63416ffe3b4d1756b14c3727025bd7