Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef391873bc83516a…

MALICIOUS

PDF

104.0 KB Created: 2021-06-25 20:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1d62911b652a0a5c6c2041ae5fa7e339 SHA-1: dc0f64b95267a608c65b90d539e8e7d87ebe9f38 SHA-256: ef391873bc83516a890dc0b7bf1051f83c70491a2b377b3942b69c6e1f77c8f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The embedded URLs and the PDF's structure suggest an attempt to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=pull+out+method+meaning PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d5ad5a53ed2dd731c0896da598bb7a6a/vodifejagizopet.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a41d1cde4---13948979227.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/besuv.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3094dd8d5a4f7a5d3bd74a80b20a6032/3563228612.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8abad55f37---tatebulobewolukisoju.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/tivukibivukoledirujoj.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/powisefuwakamuranakibep.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609125a0e26da---lakajetagotezilo.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jabazutomagegowa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6e3b71b97c984a2d5f6ed3d3b2ab6d6/10238478297.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75e012fb2---tawekesujalasep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc610b55c02---veloxojekekukabowudugelo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e9312ff6---54890283610.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jdgl9m6gvteeo0ikh2gh85nbt9/84231671551.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/32565633260.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2hr539uf99a16lpmo22o8rhfj2/robuve.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9eankns31e1522he1h803qr8t7/96297169699.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e4683aaf---virujigatezezu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/suzowajoxulomibot.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb06724fad0---93493085309.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/fosevelixijevupuzalez.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/18171811277.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/598c6e4b06a5749fa9c059911df63e22/dotuduvada.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 2816 bytes
SHA-256: badea9602b6dd6e879ae0f6f842f2d637c6409133e380e065032e3f4a2f55177
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 17340 bytes
SHA-256: eac6ccfc1b6d53e540b2ba1d757a742ab5913c9a70b4e083edd2c93a996f4f0c
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 10528 bytes
SHA-256: f01e3864b078ffc0aab990dc5da918bd0bfc70610c7164cdb85070fd7509dcd1
font_03_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 21328 bytes
SHA-256: f46bbcfc8e09379f53fc4b4565d3263832e9b548c92aa7306eba6067531df7b8
font_04_sfnt_off000177fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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