Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a9003ac7187f18…

MALICIOUS

PDF

89.4 KB Created: 2021-09-10 16:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3b42494fb7d844470bbc3b13a4ad6e4 SHA-1: 60ba90a9f5d650db141bb65ff0983b44644f89cb SHA-256: a4a9003ac7187f18b13976e63242a9f9c725b08182bcc992863dbcb0c21b21cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://alumcity.ru/userfiles/file/wipiziname.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360192523d5---78370029361.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolepowodevodabem.pdfIn PDF document text
    • https://agrando.cz/files/file/kusofaxigufeferukemezilo.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/90936640153.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rigunejatasiziluxil.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/79446147585.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210906170714.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/43307759444.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/limotonunuwufojugazapepo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e2cb3169---52964761952.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/32776907851.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109050300327998.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/pedimufijodujuk.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xigoxososaxapujefimo.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/xerunotatuwejojawukar.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/91842126427.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908222334.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/8741702641.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nojas.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea32f11de---30140339859.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/21675449052.pdfIn PDF document text
    • http://attlas.center/userfiles/file/dapufitonukuzibomur.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/296757174a0dae48ad54db775b34313b/95852870022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=yes+god+yes+watch+full+movie+online+freePDF 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_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 17596 bytes
SHA-256: dad10863188cee29ee3b9834c7d818f1813342f94bf006a818cc267b22a1d2c9
font_01_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 11272 bytes
SHA-256: 08e812c0ae4e226ff9406c4fe5b4703c8b32d9b2bae6556b5a46d61e3a30b57c
font_02_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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