Malicious PDF — malware analysis report

Static analysis result for SHA-256 3186e42dd0ce5a3f…

MALICIOUS

PDF

106.7 KB Created: 2021-06-26 07:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb46c54987f009a08d54e00dd612ae64 SHA-1: c8edea100fffa4d9c73e77ce7ef88c5944732c11 SHA-256: 3186e42dd0ce5a3fe2ff56686c35513cd3232d96590cd4ea229406360f683f3f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a6434350---nejijetunoxijavef.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83c0185d2---11329588999.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/xadoxaxepopepubaj.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832755215ee---73959837389.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/gobubifakaluwokiteworox.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rc7j7ng7bn3geisq2354fr2c5c/folozimesa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cphtnj2q6s9p8vb3d4aaee5en7/lurekubuze.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/79714097158.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06ec86a97f---8115685225.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0badc6ea4---99796416797.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/68796743934.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fm7mdrpejgishn083gtpmabgp1/zodozozovavegapadow.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xefiri.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/nomigaror.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/nafomem.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609595929e9d6---ginuwizuwefuvune.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ia390sttnic1kbg7fb08ku2m0g/55519705974.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5flecgeufbus0qv375nrod9g6s/52414295233.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nezoxobo.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/kaverijunudebonikotaji.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/11036084954.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7426a863d---96615283882.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jegiwunesudavekaj.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/68825006128e9050ef06f2bf9dd5aa64/1305009048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=point+group+symmetry+examples+pdfPDF 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_off000132f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 11160 bytes
SHA-256: 53d89ef6a6c943ba0cba8433039d25c9be1bfa5347f7c08b0eb96fabe2abf91d
font_01_sfnt_off00014cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDF 20848 bytes
SHA-256: 3b83506ecb369a602bd6997adec9cfddc5ff40e71c3760e577147116f22d6b32
font_02_sfnt_off000183d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1