Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e550a47d0bdeab…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 00:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e4d305dc879545316b43f629dade329d SHA-1: bca1ac379c9e06821ea4c67e25ae990415e82435 SHA-256: 36e550a47d0bdeab7ee39dd0554bda53934c6f9268e5155ba0168ec48bf6e85f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload directories. These links likely serve as redirects to phishing pages or malware download sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2e895638cb4d765ba15347bc0e56343d/65103902385.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/69577122485757900c6c4b82e910564a/tiwovovaxumanosinuxozu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b205239c---wodopubabujigi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9454a013fe683c19313ee1f0342720c5/gefevotozutupakusuwexur.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bde35bcdb48dee2cb1fa429989ed8305/90776441495.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d538013b9bc---fokiwizubugikeb.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/20786995303.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3cce569e---67795442050.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/miwobinuxowepe.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d7ae458067487133622b931cfb1547e7/72635437457.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/dofopomunarotogufulowaj.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c8558d882bd4d566c84e628516b9481b/tovoludamamesipivox.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/170702324218.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf6e2e6a6---petopuvowutavoramexov.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce752f4a406---35882037921.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xopuvofilopuzomirulusus.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0b9ea548816168556eb9043b420954cd/38846344625.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f490eb4cba26ffaac0f6b72e4a58a370/mofolenixa.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d7b079d13---furorinutuzagoxep.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b847ae3e1---taxogetixuzesodovomafu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a488e813df7---gezofonotudamazulolip.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/safugakowotarakipitoriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=9+month+old+bearded+dragon+dietPDF 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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 17064 bytes
SHA-256: 88b3352b3522cf2244e258ee5a7ba712769dc06f94a4fbc570aea1a35e13be8b
font_01_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 10740 bytes
SHA-256: 135507d99f0321073f6ffe012959fc735761719dc03f69085a96c2ebbd6d66a9

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