Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbde6537f653db86…

MALICIOUS

PDF

89.7 KB Created: 2021-08-11 23:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c7e3c4b521e2620c4dd17a41bf5689f3 SHA-1: 507e641c8bac32cc35cacef5918ef5f753428ec5 SHA-256: dbde6537f653db86936efe80fe3f24d85944755355f7b2fd7affd714a65920c2
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this, indicating the PDF's primary function is to facilitate access to potentially harmful external resources.

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 https://presentkompaniet.com/img/content/file/90920383587.pdf In PDF document text
    • http://imbirimbir.ru/files/63065386271.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/4q0ti4ro2c0162v6kkv1cua5q3/45577915609.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e598c62634---9071186292.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/73319715241.pdfIn PDF document text
    • https://susta.vn/userfiles/file/bokibo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0a623f5a---65604312323.pdfIn PDF document text
    • http://biosite.ru/images/news/file/31437752120.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/47102123889.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b916dc052---xetifigulenir.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751603cbe90---46672505972.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xikofod.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/basetojamiporatufu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/64293698405.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be43120deb5---19323128020.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/kopipidawonixu.pdfIn PDF document text
    • http://393citizen.com/upload/files/pifoxivumoduduworavav.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca70ec4493---raxodoronikixilibido.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/a38r78cnosq21nuupikul9pt67/42531072748.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210714073206.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/remudedebavop.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/64700236856.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/45284484771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chapter+3+cell+structure+and+function+chapter+test+a+answer+keyPDF 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_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 11312 bytes
SHA-256: 1e719729798f5d4975d50072e947841fac3c910175dc6aefc993427f603d87af
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 17532 bytes
SHA-256: 42871be3d3633064231ca09761cf8f1511e584d4ef4213078a65d51c77d9603a
font_02_sfnt_off00014063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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