Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea583b2168b31ab2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 01:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e88fe49dd58cacfd628f52af859f410 SHA-1: 952e6db8ed655ab00c2f26eb3eff2f5177e92fef SHA-256: ea583b2168b31ab26482eeab0cb9eec812dcae55d4cb68719e62e7ee8473087f
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to external PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130265b69da3---34644767306.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/50431330580.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/zaxaso.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/25195958499.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/46674548956.pdfIn PDF document text
    • http://forti.in/userfiles/file/5544995396.pdfIn PDF document text
    • http://smogy.ru/files/files/23115333088.pdfIn PDF document text
    • https://motecx.com/images/file/vokesixofenolusasenaki.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/vunetolovumunuz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d1f5c261---fubunemonekisevizinebutup.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/pawedotelew.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/81463287968.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092215035194.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/41674248642.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/69109847073.pdfIn PDF document text
    • http://machin.kr/userData/board/file/19573478756.pdfIn PDF document text
    • https://bawauang.com/contents/files/nidekoxirimoviminejamexij.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148e14523f69---pakatujiti.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210912152959.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/luseguwedere.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/72421052821.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/pipuderifemujekabadimoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=do+i+need+antivirus+on+my+android+tabletPDF 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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 17656 bytes
SHA-256: 830a4c116b1113f2d0a6f9ea52868ddc56da405b38e37a9e6fd32a76d7c9d2b8
font_01_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 10832 bytes
SHA-256: d6be2bcfd6a8ad6ebcbfbe10bc11015c4ebed715694d6060125f5c57a5b9d541

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