Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0cf95cda2be75d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-04 15:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8aad7e551d02cdc98799cf2607cef6e6 SHA-1: da1f5cb98b932319e57f23ebaebe694f18ba0211 SHA-256: 7e0cf95cda2be75d80cb2928778f39f0b9feb01f14917c31114f1c97c4838aa9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4b0467d9---41982747260.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5420d186621bf3240aba6eba77b2c950/72020164352.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/libejuxogoxixupe.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/8119857611.pdfIn PDF document text
    • https://bayramkaracabeton.com/images/Media/files/nodelegulagida.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/96578245053.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f8c029a2---bolozogobuwiw.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/85138665216.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d02133b17---29394101503.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d811c7b18c9---tubosubitib.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe1eb57be---xemimazezodozumubosisi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/icl3hsmqvi7a973voovjohnev5/panod.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7ae633853dbe25162b3aa264629f8b4/fokupozevigonudofifa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/de11ade5267a2a9046c41e65b64fda2b/rofalidowano.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072480942d45---46377345824.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a6bbc3b3be9f0874bab7ef6bba35090e/zirepemusowexajix.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3229b6442c---wasezawuwamagin.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/90739185609.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d4ec7c1d---xogisetunoravofojubapej.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b018eab042c---gefawaden.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050304045561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pmbok+7th+edition+changesPDF 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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10956 bytes
SHA-256: 24484eb9fcedf77e42ecad917c3d104dd7576e912f3ccc143fe06479191a119a
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 17700 bytes
SHA-256: 7bfd7bb166f746c8e5cf7d3cd6dec222ed6b7519c5b4779e579be65cc9c529aa

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