Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3386ce147205b86…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 16:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7b5baa7f964e5d406ddd2045c39de87 SHA-1: 0c99732e6901cffce25a4aaaea5416ef1058d033 SHA-256: b3386ce147205b86184ac2ff6bb62d2a73f6194cbe08e661b923f189a659af38
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=download+google+text+to+speech+apk PDF link annotation
    • http://manisafar.com/basefile/marcosafarir/files/xipaxatarasoxetiborilezu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/28810135262.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/welorumubumugaxi.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/tixuladoxeki.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/6680654560.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321e4c8a72b---22593180781.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/26523579488.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/vedegimosudo.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jonatimude.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/27512512073.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/54285225323.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/35347310169.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210914142407.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021962351592360.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/28554940594.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135164fdcaa1---niwikawubonagexotiki.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/vamiwez.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/vuzofubiwiwemese.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xavaxino.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/406253384.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/96011994168.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/47443314597.pdfIn PDF document text
    • http://kammed.com/userfiles/file/31045494865.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/3682370257.pdfIn PDF document text
    • http://www.celso.org/download/49141079107.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c46d9c08941f7d962ab2c2f494ccac41/kubozumipuz.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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 17944 bytes
SHA-256: 9b5b556f8530cbb08d7b8ff809542301c33f30e34576b09daebc460d8fc23b40
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 10884 bytes
SHA-256: ce567ee6d0bf84fee43a1db35a25382e5268df9da42c0e458db2add78bce86bf
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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