Malicious PDF — malware analysis report

Static analysis result for SHA-256 50031ab9f827b86a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 20:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e7ea4b2be8bbf7fc9b9d6b6645ccf3a SHA-1: 7202311ba75fba8e8be39f5002b7cec6ca6af593 SHA-256: 50031ab9f827b86a33daec449bdd6eabbc9a1490097442bb10974b974a5ac7a5
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to disposable hosting and compromised CMS upload storage, suggesting a link farm designed to obscure the ultimate destination. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary attack pattern appears to be luring users through a fake download link to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://enjoybowlramenandpoke.com/uploads/files/pabawon.pdf
    • http://tagsu.com/attachments/fckattachments/file/lipatereboxoze.pdf
    • https://zarrue.com/app/media/images_description/files/47893544175.pdf
    • https://7mark3t2-7aya.com/contents/files/62769981253.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f50842ac---45535658320.pdf
    • https://burgaseguros.com/userfiles/file/zimemufoja.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b40ddec48a---759122483.pdf
    • http://chizclean.ru/files/fck/file/25106999814.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/kipowudaxujagadibodivoxi.pdf
    • https://congnghiepxd204.vn/upload/files/detajolasosofaxewegoxaw.pdf
    • https://infoenergie-loire.org/userfiles/file/bamisubegamar.pdf
    • https://topclassgreenery.nl/images/file/50435403815.pdf
    • https://egokituz.org/files/galeria/files/jagukimezebeniruzal.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/32779922317.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/pufojete.pdf
    • http://zjqzzx.com/uploadfile/file/2021092215442273499.pdf
    • https://davaocarrental.com/images/file/levotefomovomuf.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210922_D0612192E0CD233B.pdf
    • http://uniquehotelsolutions.com/files/others/gemolefuluroxugalilazibos.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934be5c60b---67432082751.pdf
    • http://evola.it/userfiles/files/357664968.pdf
    • http://safarang.com/basefile/files/gulipa.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/fudubojisezuwadadeda.pdf
    • https://chptravel.ir/data/file/serikunagekogivivanojus.pdf
    • http://tcsklife.com/filespath/files/20210906181528.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vaikunthapurramuloo+tamil+movie+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e477.bin
59af9d8fc131f18003aa3b28000e0b3deae021d2881d2b19e0d6e3b2ca661db8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 19056 bytes
font_01_sfnt_off0001169c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 16792 bytes
font_02_sfnt_off00012eb3.bin
1e3a71ca6143202b485e22a7bf0c1604022b7940299d8e2ad3ee04d260fc5245
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 10800 bytes