Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e82936b39adf46…

MALICIOUS

PDF

83.5 KB Created: 2021-07-04 03:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99716f86513f9e0b3f42bd7401afd181 SHA-1: 05cf799e7435ca47be7aca7dc743c2a2ef247b10 SHA-256: 18e82936b39adf46356804617f07c190a65f566f08915fae6720c616b30ba83a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and potential exploitation vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=pre+authorization+on+prepaid+card PDF link annotation
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2fp98qmu2fcklm7pj1qkjnk8be/35788936700.pdfIn PDF document text
    • http://charivne.info/images/file/23708454793.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/watorolalokodemu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e119327566c2e7e3576c05b523a0dbd6/18344737802.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/56821870293.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/56233910545.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/fojivexojixi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/v9m2ljig6361v4ak6l77gqd1tr/14807319042.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tamotudewifazisaguritu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9463j3sofc1rvc8jl41l0uglb0/foxadeso.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/zubufukisivifer.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/bafuf.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/89677769488.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba68f91f5e---wuveraviwojatumotadefaku.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nazikofudojerezipinipil.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060123060373499.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210627_235845.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/jajaguwikuxok.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098c07790e10---zuruveb.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fa3b160f---powasobiwiji.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cnhl25hio91gco0t5b7oqjgj01/9559133646.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/jokivimevivimasibe.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5jlmm44n3548s6gmsv2sl9p1g3/44154204036.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/vuzulo.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16604 bytes
SHA-256: 17c623e866c4023330139a0bb818ea749a7cc9b81774942b975fcd4e9919ac8c
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 10560 bytes
SHA-256: 73aaa76e83860f3ad9c8e0634bd55fb9e069c87723f07548f0e3210c71f4469d
font_02_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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