Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245d9d0e53ebd2b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8240a9ca96f842e8c3bc79b46dbf6d0f SHA-1: 76960b48294361fa28a058336870e2a115c8ee3f SHA-256: e245d9d0e53ebd2b31dccfa46e480205304a87175404627b72d4222336e279ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://huntic.ru/uplcv?utm_term=among+us+download+for+windows+7+32+bit PDF link annotation
    • http://offerparts.com/upload/files/xuluxizo.pdfIn PDF document text
    • http://giga.sk/storage/file/72937558520.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/64519704875.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/topowata.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/31771010184.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/bulivamotusidejexe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sevowizimarop.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/29004520921.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sipikenavelu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140790f50df5---12945022490.pdfIn PDF document text
    • http://dgkno.cn/upload/41020522093.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/makeganuwumolig.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/sidovi.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/67681828555.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/58878345750.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86196260067.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150480cc7f14---88208812613.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/54972700774.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/50036013751.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d40b69d11f19492d1b4b09e0fafd2a22/vumemidowumod.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zepumiwerikebusituzudaxa.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/falowefimozanexamekogup.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/vajawikafulu.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/kagerevu.pdfIn PDF document text
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/8212997608.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092705333722.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_off0000b4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B2 17160 bytes
SHA-256: 8f3de12ca544f0c9c2fe7ed44f752450776df2d2ce8395414a777d3b4a513fb7
font_01_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 11212 bytes
SHA-256: 3f54991a9621b81b36bd298435017d0308277d92f85cddcbd6d6b5d1542db5f5

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