Malicious PDF — malware analysis report

Static analysis result for SHA-256 f267145c5a56bdff…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 16:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 379a46c63eeba5303dd763a20586cd99 SHA-1: 67efbafb099458e398374e631f9a4644a547835d SHA-256: f267145c5a56bdffe4a0bcd28190956bbcf4e8fdd6cc562f63f9760ac62dfc15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination or distribute payloads. The presence of embedded JavaScript and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://freewest.at/4114065421.pdf In PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/tikivepederewam.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/rotasezovazotadokekot.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/1102371824.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/27e2463eb205c56923396b83097a36f1/vevomopegovewexadunebi.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/tigum.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846a2e22c2---xenoluwokogoxebezuloma.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3547ab050f---jegutebogonivipodujuxif.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/74b70c990fd0d0ca83620cf4ff796a01/71485232483.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8f4cfbfcbeb848a7d727d85448daf351/tasivodi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a641ad6a0cb---denedemib.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2lvgh7qf5cv9klu06iuo1sj2nk/rudonizazidekulifo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/td41hb1m4f555cbb0ek029rtft/duxoduxibemogifur.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/naponatinuxoxuripusi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/83ac5dsm3brd0hsgmo49rfu6a8/vetamexorawojapusugit.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sb4adkqevca144s50ial1t12ui/xavuxusemofu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/78700537855.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc8c8dff8---lowewonodugowavizaw.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/luguzuzufizavivenib.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/90630993704.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/43703797858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+lock+comments+in+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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10688 bytes
SHA-256: d4d45e62fec4721926735b40b4d572a4233125719893fe3063acc50761ea09e8
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 17512 bytes
SHA-256: 507b5f246149c3bb6c0a85460b60a20eb7aca3216914fca0ee44f4d38ad82dbd
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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