Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ba2cbf80ae40a2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 23:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2585d3d1841e55988e7853446bde4b7 SHA-1: e15123db9ea1e929463c3adb5c8fe891f7f9877a SHA-256: 95ba2cbf80ae40a2bc5b60aafc6d03a60dcdfc5738253c1c41df4cb7f95b4cf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress installations or disposable hosting. The primary attack pattern involves directing users to these external URLs, which likely serve as phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://binhchuachay.info/Images_upload/files/gaguviwujevaronepisefid.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082f646b07bf---nesojuxikitakexowom.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/pojodaxofina.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13bce7d5da18b477f9ad826cf976588f/29818102445.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/delaxowatotaritosefosozi.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/66780386135.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/449bf01809b07e35e5e0cf9dfbb7ff14/5778853072.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/bagovimapevifujuta.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/nanefufovepefeso.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/44333162549.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/25572479936.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fbbkhgg5q7dhefphin95phd2jt/97890153903.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fcace0b20e093fbd11d5aee508de0955/wivovetebab.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210609_046E4F32C56852D9.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/5592254893.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/45138115736.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4fd34372acc9da3c5b88041055abfbf7/mafudenojujenolidelodoxu.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/29702419411.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409e8ca1d1---53277520058.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7vhjejngo23vjc36q33fh2oak2/39361625479.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zaxejewepugomoz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/93hk6fl4rk1cp13o86k3sgrvob/89190635615.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bd1cb9d8bab600b00cd7f8e2484477d0/71710746020.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb4b0e461---xozikigutevi.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160803eb67d939---61036982264.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///19885540404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kumpulan+khutbah+jum%27at+pdfPDF 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_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 20804 bytes
SHA-256: 519c3d402e2b596bc31ab2cbcf2d53ca0be2da7009b3dee3789ffc39aa831cbb
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 10636 bytes
SHA-256: f87fd5502729f53f3997b31942a0fdb8a8cf42e314abe4b44bb216363375c2db

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