Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a63f2d95168ea0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aa446e385c76aab7066e00b30800984 SHA-1: bd5371bf889fc9d7e6b4cafefc74d932177d884c SHA-256: 88a63f2d95168ea0c434852e51622da5b829da31268154870c2fc5e36253c54d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://autowagon.it/userfiles/files/76281030632.pdf In PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_97094724E4558646.pdfIn PDF document text
    • http://aa-nusd.jp/fixopigaw.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161328d277e56b---jewupidewerawufujer.pdfIn PDF document text
    • https://esz.jp/img/editor/files/2044362775.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/71221623729.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/80186020673.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/37675332482.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/wejilixurivopodejumowemap.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/41e1f3a929bd358a89c80a009b8155dc/fuferumenix.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/99128843523.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/3948995414.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145063ea28fb---18847032176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19827270---54581236251.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/92247083561.pdfIn PDF document text
    • https://rcot.org/userfiles/file/52892429256.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/vezowakitifotigoxabol.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/6671242573.pdfIn PDF document text
    • https://isleo.com/i_photos/file/63984833868.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/35004521696.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109080051434439.pdfIn PDF document text
    • https://cargotavio.ru/files/file/79141931951.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/zadadepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=get+cp+in+codPDF 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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 10068 bytes
SHA-256: 6801172bc34f9257ef28dcececbe60971d0dacc015f6371a5967db73a0e2cc1a
font_02_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16980 bytes
SHA-256: 623da86781765c693b19aa331aaeac99ab1ff30089ef68582236a079b80948e1