Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed2539459a0c6a1…

MALICIOUS

PDF

89.6 KB Created: 2021-09-14 04:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f71694c08b97d162d674baebee130d0 SHA-1: 4494ad6e17a757ba22a6cd1d252d8c350ec1740d SHA-256: 4ed2539459a0c6a1267d7acf4ef88fd6bfe1973460fdb29e704e7c73aff08fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98af817f7---lojijipi.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22e98262f---vinaviwukiliwupefakojijan.pdfIn PDF document text
    • http://pk.mo/userfiles/file/menufijogogitudujukabitak.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/18922852195.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/nibogipaziwurezixixunimo.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/7817308171.pdfIn PDF document text
    • http://turatabor.hu/media/74958861405.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/13707032332.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4c5b98d876f6ede493479bfb9edde1dd/toguzuralib.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tifizuz.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fidupidavenemajodobaj.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gazitegogazudizepate.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zetuxe.pdfIn PDF document text
    • http://heizler.hu/files/file/9214771333.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/65094546259.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/xekodanerivevebojurinonog.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/ridapanuwu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/taninoxi.pdfIn PDF document text
    • https://fong-cai.com/upload/files/nurimibabegebop.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/52065025669.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/fipibomijabifuxabesa.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/jojatuxoxezubo.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/talezokefad.pdfIn PDF document text
    • https://brakos.it/file/wixutus.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/jinifalivuvekevuvowelitog.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rolokunurakefuvaditezo.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/momizur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=unturned+wire+recipePDF 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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 18872 bytes
SHA-256: 8f5f41330be8b56e15be7115eb8d71ab6cdb25cee188783d866eeb1262af637e
font_01_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 10204 bytes
SHA-256: 1dffd435b8ebe7d151112cb074186597391a955bb02bf39b7477250b8360e58b
font_02_sfnt_off000140d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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