Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a8ba2932e30793…

MALICIOUS

PDF

86.9 KB Created: 2021-09-22 09:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d9d44584e0343d393f8c2686bbdc5c0 SHA-1: 77559a48fd72b490e5032e7e5a501da318c06e72 SHA-256: a7a8ba2932e3079345a556de93cd5a22c9ae09403ad1f3b22c7c3bb9bdab119d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=galaxy+note+8+how+to+screenshot PDF link annotation
    • http://sourceandsecure.com/uploads/userfiles/file/14962325960.pdfIn PDF document text
    • https://ptogel1.com/contents/files/titejitanebidite.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/mozebeloxabov.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/94447932306.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/kujuzilabuzezi.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/tevewasumanisovix.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/suvazodedevowis.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/22294916952.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/35434587146.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387934968---kexubena.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/51109377014.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/digegarikanoboderelekuwu.pdfIn PDF document text
    • http://skncn.com/u/files/zefukakab.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/lovobifejedowaruxoxisutok.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/20796466332.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nisefugewarirodokoxamod.pdfIn PDF document text
    • https://paperland.bg/uploads/file/kutitujuzijifidamerijuw.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/80798318191.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f51ee24281bb99c9e8d7d7e47a24651f/didaxadopujaduvelutugipe.pdfIn PDF document text
    • http://bushurov.ru/images/files/zekelolomoviliribavax.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/zijemiripu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c4773ba73708264b0cc7b1053848cdab/71624046709.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904044351030.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/pevewoduf.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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 10784 bytes
SHA-256: 12ddc6bbe6380e621985e2ee24b3a6347161a72495dad2c96b309bef8c53d7b0
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 17876 bytes
SHA-256: da6131177b83e33d8cfcca81af2c178e20bb616e428502b615f69edd7f541887

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