Malicious PDF — malware analysis report

Static analysis result for SHA-256 67877d7da4601cb5…

MALICIOUS

PDF

97.5 KB Created: 2021-08-26 05:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a66f167c6bef2ef3ad19df00cc035064 SHA-1: cb62573ab4701b1ca0f7bfd833405bc991dcf40a SHA-256: 67877d7da4601cb51387c11dd197d13ede052c1713df24f27d2f816c9d38d349
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. The heuristics indicate that the PDF acts as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content or phishing pages, as suggested by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hr-serdahel.hu/images/file/kogefasasefimonu.pdf In PDF document text
    • http://erex.hu/upload/file/fepemesixubevepejidaxevu.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/59966390877.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160896939a7816---suzavedoxubepe.pdfPDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3767e7df4b12b9733e53443579060aee/defoxaluritefabokuzewonoz.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5196bb5588---20756317448.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a1b9fcd03e63e6136030b20e2a40d10/tojesokoni.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/xekof.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/30568808.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/94487721047.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/33335227916.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f3650838aeb26d55f137902ba605406/lubuwikixowude.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161122e7e7df78---nijadi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bedab5aa1---84657626203.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/29785624229.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ec156765830f4714612a74af61c53de2/tezojuzaropokowolujazu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/tuzosogodajogukeron.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6df9b8e2cf---lubovazunejo.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/18929311545.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7c1a6a98e109dc31be3850982e91f6cc/66556345509.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/bixipo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/50582622180.pdfIn PDF document text
    • https://focaccellini.it/file/bogalopemigiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=synonyms+for+art+and+craftPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001071b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1071B 17236 bytes
SHA-256: 5dac93356af3f6c5ca79cb6f06269f1c2474b5831fd1d09d849a6a109f378fae
font_00_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 2524 bytes
SHA-256: d85efb512893371740f9477493cca3ad2ac6ebb07de9ef64e3316929497b990f
font_03_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 10556 bytes
SHA-256: 8fbaf39fc1a945abf3e1781e436f5123a52a72c8647b07c7557e81280ca6427b
font_04_sfnt_off000143a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 20636 bytes
SHA-256: 1a8565acdfd7ccf0d20d4d57caa748d03e2a146436b44110d62b6b888a51be9e

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