Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03dc9ad73a95dba…

MALICIOUS

PDF

91.9 KB Created: 2021-08-12 16:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9f4a48fe6b41f785eb38a7e7087d2c7f SHA-1: c5251024e4d2a7a4372ed09b97e3298646dd6680 SHA-256: a03dc9ad73a95dba21c69969792c3ec3bcea4088464829c2fa0265d90df6db26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://bimetoor.com/basefile/bimetoorir/files/95614014835.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/814h3imic18dnu4o0krbt59tb7/42362639858.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/xifemojajepofu.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/gijupa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111842811e38---44917372077.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fbdd75dd---mibufisemewigi.pdfIn PDF document text
    • https://proxus.nl/file/valubevatikijikoxariwiru.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fb81bb041ca4f5968e5bc39b244b6555/mogokor.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0bf910bc---57788628756.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/690736834608e08e481665.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/wabuvi.pdfIn PDF document text
    • https://samowar.me/userfiles/files/89069875419.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/58231671929.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/72jnpubbr6e52ns6kp1vulh771/poxuduvulejobavaxoba.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160906f347c0d1---xigesitem.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70b0a37a7---19155065040.pdfIn PDF document text
    • http://irths.com/upload_files/files/xobugunugivadowumixa.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/butedalozabewipuxodef.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bp0bu790g6dvclv3r32vdth3p7/86892684095.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c7336bc952fd175b1d7ca99d77582ea7/lagoziniseximaxamowuve.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bobedumovezemokurep.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899a538db63---86840262965.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/635940821.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210616112329_vjrmpf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fireproof+the+love+dare+list+1-40+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_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 10820 bytes
SHA-256: ae1802c46c91747db53df822677bcc0586cf24360b22d90a12de1d06f7a03d7a
font_02_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 18696 bytes
SHA-256: 9a89ced7314202a93243e6000ba6ea7994f06e29a0e2f82092fda282c780ba6e