Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2c8258e3754962…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 23:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55ef9e35ca97183fdc9461e86ea0211d SHA-1: 4ffbbc1358e09f77815f87cac48dba3ac239b668 SHA-256: de2c8258e375496233311f560d4ba3f403b3abdc258351fbbb5f8e7784bf1fbe
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. No scripts were extracted, but the structure itself is designed to lure victims through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8496f8ee86ab5fb060aba80f7bb19d5e/56901376966.pdf In PDF document text
    • http://jenan.com/ckfinder/userfiles/files/17636234719.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gl85c4foc00tqq5ntlrkk4g3c2/gijonivapatogosoza.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xoberosunujodasiguzijosu.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/61191693329.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e5546139c8358dd741a62f2fb7afa33/73222562774.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/futelukewupapodi.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/nefakuxovojutivanipa.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/959922088.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a19403cb20b---gikisubovibi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/91150366354.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/davupi.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/nobinojajejuzodenirise.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42858362684.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b28a2678e8a1332ba03417f02d6ab0c0/baxojibarokolaxoxetak.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/85797427629.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/eigbr7igbc9bgjgkcsc73gslg4/65596814944.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/vixijetil.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161251eb969541---53348739913.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/girsqeni28of503i6nsf1i7tp1/danizizu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2b458c899b371f132a6079d560b41f90/gokapovixikiwagatitew.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ff8cff79---48899451203.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/47739307105.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/40627485931.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///57863386353.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/tetisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=111+meaning+doreen+virtuePDF 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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10496 bytes
SHA-256: 64d0dde7618263f47d23c3d5bf76f2675a11b5ba6a9925b93838bddbacbcaa18
font_02_sfnt_off000115e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 17640 bytes
SHA-256: dc943efa4d784b3800a89c6adc397835d2a2a92d29d6828bd5633a5a79b5aaa4

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