Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3b28c65a6df0c8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 04:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 642d8df14672e8e0bd18847228ec5db7 SHA-1: 7fadbb43076cd9cb229d670c32f416f3d73e276c SHA-256: 9f3b28c65a6df0c85f76b9ce901095d19794fe3d7e0004948edf4e9a451fd293
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links to external websites, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive indicate a social engineering attempt to trick the user into downloading and decrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+san+andreas+lite+mali+apk PDF link annotation
    • http://snieznik.pl/userfiles/file/13359120308.pdfIn PDF document text
    • http://heureka-cz.eu/files/pozexebewonibagudowuwod.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/99216166661.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///17111256167.pdfIn PDF document text
    • http://africareview.in/userfiles/file/1956485339.pdfIn PDF document text
    • http://esistore.com/userfiles/file/riwunegewegaseninexikexo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/12850222781.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/lolebi.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/64257384778.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kelodovoxisezutuzadiwuveg.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/videmizopu.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zilewamerokek.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/57470108036.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/95416501042.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/83394037156.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/siwosetuxib.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133665880b25---1962233395.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4c6c216bbac980ed3b12a33a5ce5b8e8/japeruredawad.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139482811328---jatoxur.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/777367f7c87dcbe444b744bc6f44dfe2/68349063868.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9ad6fa308c2ed9422e3bf4c6bccde29b/gimokiluvemuxixuwafila.pdfIn PDF document text
    • http://aweibel.com/Photo/file/butosewakadurojamomebul.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5a63efb98adb04252bcb31676e13e561/63790948611.pdfIn PDF document text
    • https://tadimtursu.com/image/files/51909047589.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/dogurajinatoxupaxuj.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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 10564 bytes
SHA-256: a6956f19a2b109758de59d9de08c6451734d4b7b84c2d43a2b58a43661494f88
font_01_sfnt_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 18948 bytes
SHA-256: 72c364f08b4c45dbfbf132c7cc9349d45a3e08f8f6c6f82462579c4ae5e89efb
font_02_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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