Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0deb1307407c1f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 17:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4eb160b473cb46bf2ea56d6d2a6ca441 SHA-1: 94b45bdee433a9c8703e91b711ada02d541a2ad1 SHA-256: 5f0deb1307407c1f08531eec01d479eaa34e838f1293cc050f178b49f20c5cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The primary attack pattern involves directing users to potentially harmful external websites.

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://pixomot.ru/uplcv?utm_term=watershed+infarction+pdf PDF link annotation
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimegoribemi.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/69752996246.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/lavawemukigi.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/89683990699.pdfIn PDF document text
    • https://interconformity.ro/images/file/62547669668.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/32857021484.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb159d9f4e---ferefoxuku.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebdd71ff4---30776853303.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e8d822fdbe5181d29188bed2a0f116a4/19808782918.pdfIn PDF document text
    • http://tcihk.com/userfiles/jijulifazemakol.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/wawixabetasi.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/37415688750.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/38985044394.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/basizarobojekunirar.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210903_80F8770D29D06ACC.pdfIn PDF document text
    • http://tipiland.net/upload/file/10573730634.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zudotur.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/tasawixawuxenif.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/zemetalaleka.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/44858332075.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/zoburarufa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613392bc492ee---xepevosakan.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/38814498282.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/mifetawuzirularoboxejit.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_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 15880 bytes
SHA-256: fa9e49f638a4809476f71c41337f87a1112b75202c9fd163581b55d434d7c76b
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 10664 bytes
SHA-256: 680e179006eda34adf3b7ed4952ae269d6de9b856fcc431071bea99d13645855
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1