Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be89baaa62adcf7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 388bdcfe881ed75df13b5c0e4656dc22 SHA-1: b6e4961cfef46c5222526dbaa7d97f3d07024c70 SHA-256: 8be89baaa62adcf7cd5617eaa6f3d3ec95769a12c7730c3470f4b91be114c5b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=o3+icon+pack PDF link annotation
    • http://caerulumpharma.com/upload/files/mufogijesejuweronosava.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fddfd9eade60d14c59b60a9f5fd46236/batokoxefonajoferodiwu.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/64308844024.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/pajoturofoxetajifoxome.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/49527014585.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/mepamigakelukukejan.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/sodazadudekelegapamudi.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/15634636210.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/molixetaregonujiw.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/mipaxugizudomuvobur.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_044539.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135035ed7c6e---67423322892.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/putitowirolupojikorixe.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/bixezolekasewojenuzibefu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613568aaf3ea7---pajupusifutuxuvababaduzed.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zukamu.pdfIn PDF document text
    • http://swhos.com/upload/files/pefav.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db8c37eff---8558138813.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013b14f887---12055783674.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/683ffe4dd036f8c545dd63dc5980f3c3/pilogoke.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/50492447081.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pepigazug.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/mogopugunu.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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 10112 bytes
SHA-256: b78e66d2bd543dd7b682d5fca7b4144633d4b2ac05756dceb61333c57488d4e4
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 20284 bytes
SHA-256: 38f114121d7427214c8c1abc0599728def2d8c5d60c36c5f74944608bcb893f8
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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