Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4a55843eb898c…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 08:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40105d0fa38643164a50d9ebbb9db494 SHA-1: 4a798f80a14e553490295a6c6d7b6f9acfc0ef1e SHA-256: 70a4a55843eb898ce406a097e0b22818d5cb0d8c1fa473fb4fd1b02fbf2d416c
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The presence of 'Pdf.Phishing.Trojan' in the ClamAV detection suggests a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://poorclarescork.ie/images/53851581868.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430125031191007.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608902865ca94---73058807049.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/xikisotelajewusukogo.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/tatumumadevegiwonazetofel.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5e84dbfc---80167386115.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6bq0d77uv6iclf85qp7pq22n26/xabot.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210523232116.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kaluwox.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0abb0ec9dd---finanovirulutixolubijaf.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c7f1aa09cbfef1e3909c7a21df6e51a6/83525546831.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/pasiminawilatakuva.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/4119580409.pdfIn PDF document text
    • http://benetalent.com/upload/files/wobewosenekosimiw.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05c6716e9---18189284897.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_111535.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0732e1d2---ravatagibafuxanulas.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97ac9e017---fozirixib.pdfIn PDF document text
    • http://midel.me/userfiles/file/55233733552.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/56072746240.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05f80d49a---solozazofugosivasaxiwa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607319eb3e296---gutigowitoxetopapiba.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ajs0a2pab29sqnholjl9e9cvo6/37915138268.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cfa91c7c---9079553572.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e120ac6969cfd504519d3535d2d8b2fb/46570165641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+remove+fake+tan+stains+from+toilet+seatPDF 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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 17028 bytes
SHA-256: d69edf7ceffbdfe84a6747623d2652cb63932a828ea9d931a41e79ecdf90536e
font_01_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 10608 bytes
SHA-256: 388863cf2c202a4dec03eb92fe2897ac6900ab5c403822aace892362b10d8eb2
font_02_sfnt_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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