Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ee7717ebf72c1e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 04:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2c6f4eaafeb8221eeb5aa301c443730 SHA-1: b1359ad979e66ebba4c34ab5470dee642df178b1 SHA-256: d4ee7717ebf72c1e4db4dd8074e92c639029a1d9dc08c6945a835144a493f2e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc257a3c3---jezupoz.pdf In PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/48680726545.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/11685472286.pdfIn PDF document text
    • http://silver1979.com/upload/file/buwadizogu.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/zemixewasalomuke.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/4931865600.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/52313150347.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/denedori.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/52219842.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/33235759410.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982f0bbc8b---41295523620.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/vibalesixonilojameb.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/073r7rulguifdb2jiddhg2o8r9/xitefewigesevuvamiweka.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/93418785704.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/87738237854.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/jifuxilugojumumewu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8283db98c041932dd05ee75b853ad3ba/25492887841.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97668cf31---ruwofa.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/bigemogodabarifod.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/redefukerevafoluvasin.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/720b202fb849fcbf6cb893820d50ba9a/zurofasatapudolevasuvo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1f0c35544e300f6397a915e795c31192/77047327912.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d0a64d6f8---64815426601.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/6663454178.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906104805.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/12861236333.pdfIn PDF document text
    • http://asvpp.fr/pdf/64853539725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kidde+kn+cosm+ib+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_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 10656 bytes
SHA-256: 66d964319cf370b10ec64f2a75bc7d26c606a3990564f8f8dc4acc2a6354ad9a
font_01_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 17096 bytes
SHA-256: 714afb99e6242184bb4e7e926ee4c4a2c9b2e7c977ec9f16a978422a07a90c75
font_02_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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