Malicious PDF — malware analysis report

Static analysis result for SHA-256 1861acef28b22d8f…

MALICIOUS

PDF

94.9 KB Created: 2021-07-06 21:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d20bef3eeb0f5c1856ffaab869547d2a SHA-1: 11bd1d432efb01897d0476399049223d1a55f66a SHA-256: 1861acef28b22d8f070ff6d47a51d7ec8d7cef7d7f3ae709559e58fe283ed8c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external content. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links point towards a tactic of overwhelming the user with choices or disguising malicious links among legitimate-looking ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=multiple+linear+regression+in+r
    • https://emilline.dk/ckfinder/userfiles/files/vivipakugepubipinibizuf.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t8m9sgj2rtfbv3f9hmism6vg51/bigel.pdf
    • http://moriefrusca.com/userfiles/files/59427327903.pdf
    • https://binarbaid.com/public_html/userfiles/file/duzovomadabategi.pdf
    • http://stardentalcare.org/userfiles/file/mibovitimonabelukafapap.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607883e0b1e13---99350379576.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/87dd6d51f4c84bf33acfc79a32d4cf22/xotovakefo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1ef70c6b---wuwelatefiwidimifonu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e1d0f2ac4---xuwivaxomuzu.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ief5a8kaa3a752d9svq36p0i6a/mupavewabubobuwu.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160db0a3940683---75247615090.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5orhlnecl07vk5tpe5ltn6ruot/zuraxazama.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/tsem1g0gaks95no3j69a491fs3/89940589588.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/965bbc6b50f31d004c7553ff567f2b1f/metekibuso.pdf
    • http://backkwang.com/userData/board/file/9672824072.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/kaxugotobosi.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/dfb0f59a715deb6d2940ce8adc7c4ed1/zedofoworeresij.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lacldf8nne3uakmkrct9518pkp/kivexererikuwefixipu.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/ql2mril09kaheteo5un309k3c4/korelusi.pdf
    • http://epoch-making.jp/js/upload/files/nunapofejamufa.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/domazofigokob.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82d067e96---26509982537.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/98f90c57cbb8abb478374163f8ce6093/6579766859.pdf
    • http://dienmaythanglong.org/uploads/files/91444403506.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06f45bd6b1---85876302111.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/108f6f927fed3233acd18d6fb5940312/wunuxisififupesusekotom.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_off00010c0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 16792 bytes
font_01_sfnt_off0001241c.bin
0e270841326c80c749b6e8ab979feef9d013f2e9184018a5bb78f06091d9d44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 18428 bytes
font_02_sfnt_off00015452.bin
97fe88b97b5f98dd62779421b204df044679e6cda6118563deefe2b93f1c68dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15452 10520 bytes

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