Malicious PDF — malware analysis report

Static analysis result for SHA-256 772bb4e9d495f946…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 19:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e330cf40d7e021f5d7e37f27c668b22 SHA-1: ced7cc50402d5d211954b57a7bd30764367a3514 SHA-256: 772bb4e9d495f9467eb2a856cdcd1e274454f1045b02746d24e8026e01bebfd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=na+guiding+principles+pdf PDF link annotation
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/wewuzebugebi.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/46735760123.pdfIn PDF document text
    • http://hejia-ele.net/upload/8858623480.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/minewebibazakixa.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/lulegosetibid.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e47jalo3l4283gdau7rhk1su77/davugeg.pdfIn PDF document text
    • http://brlairport.com/images/file/10921448553.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5e9ff1a8b7eae2a761d972499d701378/30759438301.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/32212862570.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/woxig.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tetipoliponunoluzarazariv.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/kiwavu.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8240152360.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/95423940704.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc51bb3bd---3315420783.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/nitegosemegugifokovu.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/31173651714.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/sozewoporog.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/27655152302.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76261503824.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zesalotiremolopezuzused.pdfIn PDF document text
    • http://cbstav.cz/file/guzitiwasisijekomuvetisa.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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 16216 bytes
SHA-256: 6d02a9d94d34a3d656b3b29ece9d2673e03b85eba16bff5606b97473a62a46de
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10656 bytes
SHA-256: 7e566920ffc71426757796667e8e44b6f88916dafe6c726e8c3a2fedf9912806
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1