Malicious PDF — malware analysis report

Static analysis result for SHA-256 2045666c5370c996…

MALICIOUS

PDF

95.8 KB Created: 2021-08-01 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d18981fa3653d2c5790a208038ad77d SHA-1: 6069f00a02eeff5cf1f5e359f867bc04180d98ab SHA-256: 2045666c5370c996f99ecfbcad2508256ef412f7fa5a8ceda0c42dad6871ff7a
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier strongly indicates malicious intent, and the structure suggests it's designed to redirect users, potentially for SEO manipulation or to serve further malicious content. The presence of external URIs and link farm characteristics points towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=how+to+set+pokemon+accutime+watch PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090548e52fc4---40477878280.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a973d6652---63159978200.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/linerajekiwalevix.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/19576458652.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/77194692983.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c459fe20169---runipexewolesedefag.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c778356bfc---54783763523.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vojesikobenupudezat.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/l2te7fvj5linjctb03igp4ksnh/gekafematowonozokotatak.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/76861431744.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cf2kn3ljf4lcde8jefcq759rb3/40078655437.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/13211179442.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/70771153324.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/af678e1facd3cabdeeb1a6fa435caeff/rapetezivotasu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/lorotekumepowuvubije.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/geloxazefusisos.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/xepodovix.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/gewaruvilapelazeru.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609408242079a---togabonofol.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5a42bce7141353a69228555f49993564/rukaxesomarab.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea95e145f---pabanemonogizefujowugu.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/reguvitugo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/56f845209b3cd50ca3a88d0763f96f06/weminezasupaf.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/90149538057.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/86173138705.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a395aca2fcf8ed06d66b5d18aa8257c1/lojetipekimemiz.pdfIn PDF document text
    • 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_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 17360 bytes
SHA-256: ece1f1cf4acfed9f2f6e462419913750c0ce97dbecc4980cf5481e3a11fb39b8
font_01_sfnt_off0001404e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15865 10760 bytes
SHA-256: 85a2c1177ae59199b7d9666593b0f554717c1aa10faf7631e7573b2a11c1dbe9

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