Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd218e6f7a57fa21…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 04:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ab3e41c1379630e8fe8c934a0f799bd SHA-1: b75c1d88cf563942108260eb512eeee89e529e20 SHA-256: dd218e6f7a57fa2114eebeca670dceee69ad831ce2ff37ece77e60fd1cb66e57
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=app+for+android+and+iphone+facetime PDF link annotation
    • https://qwert5.com/psum/admin/userfiles/file/zaberisosugedaferuxefig.pdfIn PDF document text
    • https://mihalex.by/files/files/38201199781.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/fujaturukisawowobe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8b68c059---93639162643.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/84862961346.pdfIn PDF document text
    • http://boldogelet.hu/media/75765289209.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/diwenijurobagirepofojojoj.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/67245668028.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/dabisizawalebetiziwudim.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccac6c0d9b---linaloxa.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eb0e5562f---linuru.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/josepovebuxibaluxu.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31336481703.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471ef68a3aa---61713184889.pdfIn PDF document text
    • http://ruresept.ru/files/file/59954260699.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/lekitulewenufexeralebeja.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/dizuwavatobos.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/16578724361.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nijufuwurijakivawer.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/bakexaziwonusedemodoz.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/lenupejutefixamebeb.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/ralizefexiwozobesunufi.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/56388784953.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_off0000b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 17276 bytes
SHA-256: 92cccc3d8f5aad1b322fff19f13224ba997dbb617c124aa07a6c8b12fc9c3a8d
font_01_sfnt_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 10652 bytes
SHA-256: 4471d78d5b0f75de19c618280baf07b8d203bdbe1e810b172854f88e497f5e5a
font_02_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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