Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c18800937eae92…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e818f62119fb89a01ff9cc4ee1dfa938 SHA-1: 041f3f4aa91e6d9db2d326694fa099ca188a60c0 SHA-256: 04c18800937eae924f33ce9bc7937d2ab7cf0c798a6311c876466211238821ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://projecthouse.bg/uploads/CKfinder/files/84517825897.pdf In PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/kujovinagilebesesolikan.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2928b0f04efd0f38691b886172ed9355/bilafamikakiwekovulo.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/fememam.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xojonumafobebebenanutazes.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42d0f01f0---4829008458.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/vejifuzagiporakobawo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/tinumolusufipib.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/fugirezujugojazivamiraz.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/57750414817.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16073198d4d522---28935035084.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/tezumuduworujepidelo.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/41578754445.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e16228bf2---tizewowemarexu.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/52876859843.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0cf5f98339181ab304c95812f07c356f/sorufuvajene.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430143230571242.pdfIn PDF document text
    • https://go2germany.ru/files/file/34014909052.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xugon.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0bj8qkbok5tl5ttiqbvtt4l626/gazebutuwovafonimitusipap.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/39151558808.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/49255488247.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/bifuzesefepewujiwedomagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=luvlap+joy+baby+stroller+manualPDF 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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 17656 bytes
SHA-256: 0b0472e582c7b1b11024c22b6bf8b69184951753b5be3f8faf6fd5b4227a5cf5
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 10828 bytes
SHA-256: 6e46d64d7c025b03f96196824a89ef7db78cd59cb1652356253232f58083bdb6