Malicious PDF — malware analysis report

Static analysis result for SHA-256 be458c0887a36cbb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 00:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0dc7857767d78f37b9bca1cc3b782b5 SHA-1: 1afc0837ad08b23e75fdcc7751d2311d7f9683c1 SHA-256: be458c0887a36cbb0dfa545cd1e2f2d1cef8f2bc77666ce4d146108250a8eeb0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to infer a malicious link-farming pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mahnomenalumni.com/clients/879209/File/85817825865.pdf In PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xeserewaxojalozezit.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/67618802493.pdfIn PDF document text
    • https://europartner2.pl/uploads/kerazikimivolifemajel.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gotulebefapawisale.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76982299468.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b044886119f---naxodepopejeradofu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/lapeduderetakeriziwevuxuj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f58db5e9b---7892843736.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/18565358155.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/puwefivizomuza.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cta7v3fblln7themviokjo3fi/78204882292.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde7020dd03---wokomiwigesafomokoko.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/oh5qi3dov5pvg79k9cau3b1mp4/fumosusuvokivesaxew.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/kuranapafuliwinofoduritax.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/56844026949.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/towojexapagazop.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kakogatome.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a808ac27c---dozanigavirugipemu.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a4a1a3af9599032cd205c774f0b11dd1/tomuvupojozun.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/dekezimoja.pdfIn PDF document text
    • http://ruihuitax.com/files/file/17901954640.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161368c8144a19---zadizesuwapusisupe.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f387292a95f---sulogibibe.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/38825925891.pdfIn PDF document text
    • https://fishuntpesca.it/file/fesibojib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=autotable+jspdf+angular+5PDF 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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 11064 bytes
SHA-256: 7b98d1c255f70a40ac0cfe4da8a45c64f4570f08561d7ffb17c252b701e5bbda
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 21592 bytes
SHA-256: 62ea7ffa931830d7d581e75c457a64ee1eee9a72b9d7fbd72b071594148b6327
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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