Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5a4ea5ee4989cb…

MALICIOUS

PDF

95.2 KB Created: 2021-09-13 22:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a86d57dd0a8dc305b0398c81318320ed SHA-1: a4bd38d65cd71e83edbd509ffcaad1a493c21447 SHA-256: 2e5a4ea5ee4989cb9eb8fb96dde59abe235c5454a5b22da108104ab48a21ca28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript could be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://puebloexec.com/userfiles/file/23992034999.pdf In PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/nivusofevaguvenibo.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909210355.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7e3fbeffa1f7c999981b983a4693a038/xuvobemaniraz.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/xebufoxezovuxajokawa.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/zawegijojavamurino.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/dekefulixijusalo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/65031843417.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/g2n2mqbdfelpffkhroob90lkq5/91196492506.pdfIn PDF document text
    • https://mkontakt.com/dat/file/39976131321.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/turevebeburetemodapefifa.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/rowutopunararuzemenozade.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20ed720b3---12985678437.pdfIn PDF document text
    • http://bptramptour.pl/files/file/70861254254.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kevitijojajeb.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/zopepixamumijoreseredo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd28ac4ee---nibaxegajituviw.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zuwanazog.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/femobofepowevo.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/45079866958.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/turutazinixotawu.pdfIn PDF document text
    • http://splogservice.ru/content/files/surufom.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/86806037192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dawn+of+war+cheatsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 26444 bytes
SHA-256: 4f30fff714a307ba3f49492f71c553b8b9bf978512810c3101987e381f7abac8
font_02_sfnt_off000135a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 10384 bytes
SHA-256: 1ca62ccc7fce429c47a1cdc800fd2d2e9282d08826385b345472c44983e0d0ac
font_03_sfnt_off00014d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16543 2084 bytes
SHA-256: f6e284136e8e0fb5b0f7d359131c4d84ec28df79e1ab6fc67c5286eb9281b494

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